Clean packets on the network when closing + made loopback test actually run again.

BUG=

Review URL: https://webrtc-codereview.appspot.com/1290006

git-svn-id: http://webrtc.googlecode.com/svn/trunk/webrtc@3776 4adac7df-926f-26a2-2b94-8c16560cd09d
2 files changed