[Build][202106] Fix libyang build broken issue

[xumia]

Why I did it

The libyang cannot be built with the latest version of cmake.
Example: https://dev.azure.com/mssonic/build/_build/results?buildId=181862&view=logs&j=993d6e22-aeec-5c03-fa19-35ecba587dd9&t=d0538dec-1681-5ff8-bd45-c0de13be9706

[ 96%] Building CXX object swig/python2/CMakeFiles/_yang2.dir/yangPYTHON_wrap.cxx.o
/sonic/src/libyang/libyang-1.0.73/build/swig/python2/yangPYTHON_wrap.cxx:3292:33: error: expected initializer before '.' token
 #  define SWIG_init    init_yang.so
                                 ^
/sonic/src/libyang/libyang-1.0.73/build/swig/python2/yangPYTHON_wrap.cxx:102537:1: note: in expansion of macro 'SWIG_init'
 SWIG_init(void) {
 ^~~~~~~~~
/sonic/src/libyang/libyang-1.0.73/build/swig/python2/yangPYTHON_wrap.cxx:101971:24: warning: 'swig_const_table' defined but not used [-Wunused-variable]
 static swig_const_info swig_const_table[] = {

See relative issue: #4315

How I did it

Not upgrade the cmake, change to use the dbus-python 1.2.18 which is compatible with cmake 3.13.4

How to verify it

See https://dev.azure.com/mssonic/build/_build/results?buildId=194756&view=results

Which release branch to backport (provide reason below if selected)

• 201811
• 201911
• 202006
• 202012
• 202106
• 202111
• 202205
• 202211

Description for the changelog

Ensure to add label/tag for the feature raised. example - PR#2174 under sonic-utilities repo. where, Generic Config and Update feature has been labelled as GCU.

Link to config_db schema for YANG module changes

A picture of a cute animal (not mandatory but encouraged)

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: xumia (a047b96)