commit 1ab67aef80cd1461ad3446aa7f53b82d833352fa
author Guo-wei Shieh <guoweis@chromium.org> Tue May 19 04:36:20 2015
committer Guo-wei Shieh <guoweis@chromium.org> Tue May 19 04:36:06 2015
tree b79e6999d4f9031f9b553c125b0f240650ac6a61
parent b92be45c858b43d1d064f3c49796a440e9917874

Address the corner cases

1. when an IP is reported by DNS but it doesn't serve any traffic, we shouldn't count failure from that.
2. shared socket mode should should only be true for the case where multiple IPs are resolved and successfully pinged.
3. allow multiple STUN servers now.

Fix a bug in symnat detection. SymNAT will provide the same IP but different port.

If we have more than 1 srflx IP, we'll fail the experiment.

BUG=4576
R=pthatcher@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/51849004

Cr-Commit-Position: refs/heads/master@{#9215}