[MODCLUSTER-414] Fix compilation warnings in the native part - mod_advertise part:
* line 89: unused variable (ma_listen_socket)
* line 178: string literals need to be compared using strcmp()
* line 657: wrong format for port %l but port is defined as int
* line 734: wrong format with precision loss, type long int but printed as %d
[MODCLUSTER-414] Fix compilation warnings in the native part - mod_manager part:
* fix several problems when uninitialized value was returned
Merge pull request #89 from rhusar/MODCLUSTER-414_compilation_warnings

[MODCLUSTER-414] Fix compilation warnings in the native part (mod_advertise+mod_manager)