Compile DIAL client and server for macOS.

Changes:
* Added method to get mac and ip address for OSX. Current Linux method
of query via SIOCGIFCONF doesn't work. Added code to read via getifaddrs() API.
* Put non OSX specific code under #ifdef flags.
* Removed few linker libraries which are not required (lcares and lrt).
* Fixed many warnings.

Tested on: OSX 10.12

client/DialConformance.h

@@ -65,7 +65,6 @@ public:
         string &outputFile );
 private:
     DialConformance();
-    DialServer*                 _pServer;
     static DialConformance*     sConformance;
     DialClientInput             _input;