ALLJOYN-2483 Fix IpNameService to send out the final IsAt packets before terminating.

Change-Id: Ia54ee5e39b6c1f7ff9149d2b5e8cd0d735692400
Fixed several warnings reported by GCC compliler

- DBusStdDefines was placing placing an int in the code when the value
  should be an unsigned int.  This was causing compilation warnings
  regarding signed unsigned comparisons
- ProxyBusObjectTest removed unused variable

Change-Id: I0861d016e74caae65518d110f845e5a376b638d1