* nua: moved nua_server* and nua_client* code into their own files
Ignore-this: 23d66f0189ef8e324c2f23266f0ccf2
Added nua_server.h, nua_server.c, nua_client.h, nua_client.c.
git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@11864 d0543943-73ff-0310-b7d9-9358b9ac24b2