* s2check: added s2base.[hc], s2sip.[hc]
  Ignore-this: 6a32b36a47a6f9dd2b5fec7c7375c564
  
  Moved nua/test_s2 code here.



git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@12388 d0543943-73ff-0310-b7d9-9358b9ac24b2