enable ServiceAddress to be set

[sovaa]

Supporting setting --address=hostname for python-consul to register a service address that consul reports as ServiceAddress:

$ ianitor --help  | grep address
               [--address hostname] [--port PORT] [-v]
  --consul-agent=hostname[:port]  set consul agent address
  --address=hostname              set service address (if different than agent
                                  address)

ianitor --address=10.20.1.15 --consul-agent 10.20.1.124 --tags recs --port 5656 --id recs-mk2 recs -- gunicorn --workers 1 --threads 1 --worker-class eventlet -b 0.0.0.0:5656 app:app

Listing the service:

>>> pprint(c.catalog.service('recs'))
('1675',
 [{'Address': '10.20.1.124',
   'CreateIndex': 1675,
   'Datacenter': 'lab',
   'ID': '36c47aa1-8745-8867-6f4f-6d5b85b0b792',
   'ModifyIndex': 1675,
   'Node': 'maggie-kroesus-1',
   'NodeMeta': {'consul-network-segment': ''},
   'ServiceAddress': '10.20.1.15',
   'ServiceEnableTagOverride': False,
   'ServiceID': 'recs-mk2',
   'ServiceName': 'recs',
   'ServicePort': 5656,
   'ServiceTags': ['recs'],
   'TaggedAddresses': {'lan': '10.20.1.124', 'wan': '10.20.1.124'}}])

[sovaa]

Sorry, didn't notice there already was a PR for this.

[swistakm]

I'm reopenning this because because there is something wrong with previous PR's diff (#14)

[swistakm]

This feature is now merged and released as 0.1.0