Enable DTLS for peerconnection example. If it's a loopback test, then we recreate another peerconnection with DTLS off.

BUG=3872
TEST=Manual Test
R=jiayl@webrtc.org, tommi@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/36989004

Cr-Commit-Position: refs/heads/master@{#8193}
git-svn-id: http://webrtc.googlecode.com/svn/trunk@8193 4adac7df-926f-26a2-2b94-8c16560cd09d
3 files changed