move xmpp and p2p to webrtc

Create a copy of talk/xmpp and talk/p2p under webrtc/libjingle/xmpp and
webrtc/p2p. Also makes libjingle use those version instead of the one in the talk folder.

BUG=3379

Review URL: https://webrtc-codereview.appspot.com/26999004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@7549 4adac7df-926f-26a2-2b94-8c16560cd09d

talk/libjingle_examples.gyp

@@ -39,8 +39,8 @@
         'libjingle.gyp:libjingle_p2p',
       ],
       'sources': [
-        'xmpp/jingleinfotask.cc',
-        'xmpp/jingleinfotask.h',
+        '<(webrtc_root)/libjingle/xmpp/jingleinfotask.cc',
+        '<(webrtc_root)/libjingle/xmpp/jingleinfotask.h',
       ],
     },  # target libjingle_xmpphelp
     {