Adding TSAN suppression for test posix udp transport.
Adding TSAN suppression for test posix udp transport.

This is race for reading a bool in the WebRTC test UDP transport and
not in any production code.

R=kjellander@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/2159006

git-svn-id: 917f5d3ca488f358c4d40eaec14422cf392ccec9@4663 4adac7df-926f-26a2-2b94-8c16560cd09d

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