Add additional logging for config sync

[Crunsher]

• Write logs with the PID (to know what daemon logged it)
• Log who sent a config update
• Log the timestamp version of a zone config received

[dnsmichi]

As discussed, the log addition breaks an HA cluster. I need to work on #5133 and therefore will provide a fix by myself.

[2017-05-12 10:11:50 +0200] information/ApiListener: Applying configuration file update for path './icinga2a/lib/icinga2/api/zones/master'. Received timestamp '2017-05-12 10:11:50 +0200' (1494576710.718512) is more recent than current timestamp '2017-05-12 10:10:53 +0200' (1494576653.584635).
[2017-05-12 10:11:50 +0200] information/ApiListener: Copying 1 zone configuration files for zone 'satellite' to './icinga2a/lib/icinga2/api/zones/satellite'.
[2017-05-12 10:11:50 +0200] information/ApiListener: Applying configuration file update for path './icinga2a/lib/icinga2/api/zones/satellite'. Received timestamp '2017-05-12 10:11:50 +0200' (1494576710.720124) is more recent than current timestamp '2017-05-12 10:10:53 +0200' (1494576653.588971).
[2017-05-12 10:11:50 +0200] information/ApiListener: Adding new listener on port '7000'
[2017-05-12 10:11:50 +0200] information/ConfigItem: Activated all objects.
[2017-05-12 10:11:50 +0200] information/ApiListener: Reconnecting to API endpoint 'icinga2b' via host 'localhost' and port '8000'
[2017-05-12 10:11:50 +0200] information/ApiListener: Reconnecting to API endpoint 'icinga2c' via host 'localhost' and port '9000'
[2017-05-12 10:11:50 +0200] critical/Socket: Invalid socket: Connection refused
[2017-05-12 10:11:50 +0200] critical/Socket: Invalid socket: Connection refused
[2017-05-12 10:11:50 +0200] critical/ApiListener: Cannot connect to host 'localhost' on port '8000'
[2017-05-12 10:11:50 +0200] critical/ApiListener: Cannot connect to host 'localhost' on port '9000'
[2017-05-12 10:11:55 +0200] warning/TlsStream: TLS stream was disconnected.
[2017-05-12 10:11:55 +0200] critical/ApiListener: Client TLS handshake failed (from [::1]:59420)
Context:
	(0) Handling new API client connection

[2017-05-12 10:11:55 +0200] information/ApiListener: New client connection from [::1]:59421 (no client certificate)
[2017-05-12 10:11:55 +0200] warning/TlsStream: TLS stream was disconnected.
[2017-05-12 10:11:56 +0200] warning/ApiListener: No data received on new API connection for identity ''. Ensure that the remote endpoints are properly configured in a cluster setup.
Context:
	(0) Handling new API client connection

[2017-05-12 10:12:05 +0200] information/ApiListener: New client connection for identity 'icinga2b' from [::1]:59438
[2017-05-12 10:12:05 +0200] information/ApiListener: Sending config updates for endpoint 'icinga2b'.
[2017-05-12 10:12:05 +0200] information/ApiListener: Syncing configuration files for global zone 'global-templates' to endpoint 'icinga2b'.
[2017-05-12 10:12:05 +0200] information/ApiListener: Syncing configuration files for zone 'master' to endpoint 'icinga2b'.
[2017-05-12 10:12:05 +0200] information/ApiListener: Syncing configuration files for zone 'satellite' to endpoint 'icinga2b'.
[2017-05-12 10:12:05 +0200] information/ApiListener: Syncing runtime objects to endpoint 'icinga2b'.
Assertion failed: (px != 0), function operator->, file /usr/local/include/boost/smart_ptr/intrusive_ptr.hpp, line 198.
Process 95631 stopped
* thread #8: tid = 0x126028a, 0x00007fff99a9ddd6 libsystem_kernel.dylib`__pthread_kill + 10, stop reason = signal SIGABRT
    frame #0: 0x00007fff99a9ddd6 libsystem_kernel.dylib`__pthread_kill + 10
libsystem_kernel.dylib`__pthread_kill:
->  0x7fff99a9ddd6 <+10>: jae    0x7fff99a9dde0            ; <+20>
    0x7fff99a9ddd8 <+12>: movq   %rax, %rdi
    0x7fff99a9dddb <+15>: jmp    0x7fff99a96cdf            ; cerror_nocancel
    0x7fff99a9dde0 <+20>: retq
(lldb) bt
* thread #8: tid = 0x126028a, 0x00007fff99a9ddd6 libsystem_kernel.dylib`__pthread_kill + 10, stop reason = signal SIGABRT
  * frame #0: 0x00007fff99a9ddd6 libsystem_kernel.dylib`__pthread_kill + 10
    frame #1: 0x00007fff99b89787 libsystem_pthread.dylib`pthread_kill + 90
    frame #2: 0x00007fff99a03420 libsystem_c.dylib`abort + 129
    frame #3: 0x00007fff999ca893 libsystem_c.dylib`__assert_rtn + 320
    frame #4: 0x00000001006e89a9 libremote.2.6.3.dylib`boost::intrusive_ptr<icinga::Zone>::operator->(this=0x0000000101e3e0f0) const + 73 at intrusive_ptr.hpp:198
    frame #5: 0x000000010077c3b9 libremote.2.6.3.dylib`icinga::ApiListener::ConfigUpdateHandler(origin=0x0000700009016008, params=0x0000700009015dd8) + 1577 at apilistener-filesync.cpp:287
    frame #6: 0x00000001007095ec libremote.2.6.3.dylib`boost::detail::function::function_invoker2<icinga::Value (*)(boost::intrusive_ptr<icinga::MessageOrigin> const&, boost::intrusive_ptr<icinga::Dictionary> const&), icinga::Value, boost::intrusive_ptr<icinga::MessageOrigin> const&, boost::intrusive_ptr<icinga::Dictionary> const&>::invoke(function_ptr=0x0000000101b08b28, a0=0x0000700009016008, a1=0x0000700009015dd8) + 92 at function_template.hpp:101
    frame #7: 0x00000001006cc26f libremote.2.6.3.dylib`boost::function2<icinga::Value, boost::intrusive_ptr<icinga::MessageOrigin> const&, boost::intrusive_ptr<icinga::Dictionary> const&>::operator(this=0x0000000101b08b20, a0=0x0000700009016008, a1=0x0000700009015dd8)(boost::intrusive_ptr<icinga::MessageOrigin> const&, boost::intrusive_ptr<icinga::Dictionary> const&) const + 191 at function_template.hpp:770
    frame #8: 0x00000001006cc19b libremote.2.6.3.dylib`icinga::ApiFunction::Invoke(this=0x0000000101b08b00, origin=0x0000700009016008, arguments=0x0000700009015dd8) + 59 at apifunction.cpp:31
    frame #9: 0x0000000100868df8 libremote.2.6.3.dylib`icinga::JsonRpcConnection::MessageHandler(this=0x0000000101d6e800, jsonString=0x0000000101e08c78) + 3096 at jsonrpcconnection.cpp:202
    frame #10: 0x0000000100867ff8 libremote.2.6.3.dylib`icinga::JsonRpcConnection::MessageHandlerWrapper(this=0x0000000101d6e800, jsonString=0x0000000101e08c78) + 88 at jsonrpcconnection.cpp:148
    frame #11: 0x000000010086cbd3 libremote.2.6.3.dylib`void boost::_mfi::mf1<void, icinga::JsonRpcConnection, icinga::String const&>::call<boost::intrusive_ptr<icinga::JsonRpcConnection>, icinga::String const>(this=0x0000000101e08c60, u=0x0000000101e08c70, (null)=0x0000000000000000, b1=0x0000000101e08c78) const + 131 at mem_fn_template.hpp:156
    frame #12: 0x000000010086cb41 libremote.2.6.3.dylib`void boost::_mfi::mf1<void, icinga::JsonRpcConnection, icinga::String const&>::operator(this=0x0000000101e08c60, u=0x0000000101e08c70, a1=0x0000000101e08c78)<boost::intrusive_ptr<icinga::JsonRpcConnection> >(boost::intrusive_ptr<icinga::JsonRpcConnection>&, icinga::String const&) const + 49 at mem_fn_template.hpp:171
    frame #13: 0x000000010086cadc libremote.2.6.3.dylib`void boost::_bi::list2<boost::_bi::value<boost::intrusive_ptr<icinga::JsonRpcConnection> >, boost::_bi::value<icinga::String> >::operator(this=0x0000000101e08c70, (null)=type<void> @ 0x0000700009016598, f=0x0000000101e08c60, a=0x00007000090165c0, (null)=0)<boost::_mfi::mf1<void, icinga::JsonRpcConnection, icinga::String const&>, boost::_bi::list0>(boost::_bi::type<void>, boost::_mfi::mf1<void, icinga::JsonRpcConnection, icinga::String const&>&, boost::_bi::list0&, int) + 108 at bind.hpp:319
    frame #14: 0x000000010086ca6a libremote.2.6.3.dylib`boost::_bi::bind_t<void, boost::_mfi::mf1<void, icinga::JsonRpcConnection, icinga::String const&>, boost::_bi::list2<boost::_bi::value<boost::intrusive_ptr<icinga::JsonRpcConnection> >, boost::_bi::value<icinga::String> > >::operator(this=0x0000000101e08c60)() + 58 at bind.hpp:1294
    frame #15: 0x000000010086c770 libremote.2.6.3.dylib`boost::detail::function::void_function_obj_invoker0<boost::_bi::bind_t<void, boost::_mfi::mf1<void, icinga::JsonRpcConnection, icinga::String const&>, boost::_bi::list2<boost::_bi::value<boost::intrusive_ptr<icinga::JsonRpcConnection> >, boost::_bi::value<icinga::String> > >, void>::invoke(function_obj_ptr=0x00007000090167d8) + 32 at function_template.hpp:159
    frame #16: 0x0000000100fecfa8 libbase.2.6.3.dylib`boost::function0<void>::operator(this=0x00007000090167d0)() const + 120 at function_template.hpp:770
    frame #17: 0x0000000101234a94 libbase.2.6.3.dylib`icinga::WorkQueue::WorkerThreadProc(this=0x0000000102812c08) + 3364 at workqueue.cpp:233
    frame #18: 0x0000000101237659 libbase.2.6.3.dylib`boost::_mfi::mf0<void, icinga::WorkQueue>::operator(this=0x0000000101d68ce0, p=0x0000000102812c08)(icinga::WorkQueue*) const + 105 at mem_fn_template.hpp:49
    frame #19: 0x0000000101237fa0 libbase.2.6.3.dylib`void boost::_bi::list1<boost::_bi::value<icinga::WorkQueue*> >::operator(this=0x0000000101d68cf0, (null)=type<void> @ 0x0000700009016e48, f=0x0000000101d68ce0, a=0x0000700009016e70, (null)=0)<boost::_mfi::mf0<void, icinga::WorkQueue>, boost::_bi::list0>(boost::_bi::type<void>, boost::_mfi::mf0<void, icinga::WorkQueue>&, boost::_bi::list0&, int) + 80 at bind.hpp:259
    frame #20: 0x0000000101237f4a libbase.2.6.3.dylib`boost::_bi::bind_t<void, boost::_mfi::mf0<void, icinga::WorkQueue>, boost::_bi::list1<boost::_bi::value<icinga::WorkQueue*> > >::operator(this=0x0000000101d68ce0)() + 58 at bind.hpp:1294
    frame #21: 0x0000000101237edc libbase.2.6.3.dylib`boost::detail::thread_data<boost::_bi::bind_t<void, boost::_mfi::mf0<void, icinga::WorkQueue>, boost::_bi::list1<boost::_bi::value<icinga::WorkQueue*> > > >::run(this=0x0000000101d68ae0) + 28 at thread.hpp:116
    frame #22: 0x000000010010dc14 libboost_thread-mt.dylib`boost::(anonymous namespace)::thread_proxy(void*) + 164
    frame #23: 0x00007fff99b86aab libsystem_pthread.dylib`_pthread_body + 180
    frame #24: 0x00007fff99b869f7 libsystem_pthread.dylib`_pthread_start + 286
    frame #25: 0x00007fff99b861fd libsystem_pthread.dylib`thread_start + 13
(lldb) up
frame #1: 0x00007fff99b89787 libsystem_pthread.dylib`pthread_kill + 90
libsystem_pthread.dylib`pthread_kill:
    0x7fff99b89787 <+90>:  cmpl   $-0x1, %eax
    0x7fff99b8978a <+93>:  jne    0x7fff99b89793            ; <+102>
    0x7fff99b8978c <+95>:  callq  0x7fff99b8b1fa            ; symbol stub for: __error
    0x7fff99b89791 <+100>: movl   (%rax), %eax
(lldb)
frame #2: 0x00007fff99a03420 libsystem_c.dylib`abort + 129
libsystem_c.dylib`abort:
    0x7fff99a03420 <+129>: movl   $0x2710, %edi             ; imm = 0x2710
    0x7fff99a03425 <+134>: callq  0x7fff999d4e68            ; usleep$NOCANCEL
    0x7fff99a0342a <+139>: callq  0x7fff99a0342f            ; __abort

libsystem_c.dylib`__abort:
    0x7fff99a0342f <+0>:   cmpq   $0x0, 0x8d95cf1(%rip)     ; gCRAnnotations + 7
(lldb)
frame #3: 0x00007fff999ca893 libsystem_c.dylib`__assert_rtn + 320
libsystem_c.dylib`basename_r:
    0x7fff999ca893 <+0>: pushq  %rbp
    0x7fff999ca894 <+1>: movq   %rsp, %rbp
    0x7fff999ca897 <+4>: pushq  %r15
    0x7fff999ca899 <+6>: pushq  %r14
(lldb)
frame #4: 0x00000001006e89a9 libremote.2.6.3.dylib`boost::intrusive_ptr<icinga::Zone>::operator->(this=0x0000000101e3e0f0) const + 73 at intrusive_ptr.hpp:198
   195
   196 	    T * operator->() const
   197 	    {
-> 198 	        BOOST_ASSERT( px != 0 );
   199 	        return px;
   200 	    }
   201
(lldb)
frame #5: 0x000000010077c3b9 libremote.2.6.3.dylib`icinga::ApiListener::ConfigUpdateHandler(origin=0x0000700009016008, params=0x0000700009015dd8) + 1577 at apilistener-filesync.cpp:287
   284
   285 		Log(LogInformation, "ApiListener")
   286 		    << "Applying config update from endpoint '" << origin->FromClient->GetEndpoint()->GetName() << "' of zone  '"
-> 287 		    << origin->FromZone->GetName() << "'";
   288
   289 		Dictionary::Ptr updateV1 = params->Get("update");
   290 		Dictionary::Ptr updateV2 = params->Get("update_v2");