guoweis 066ded99cb Relax the stun ping check on valid result.
1. allow situation where all ping is lost
2. use the raw count to calculate the interval.

Since we now send 1 request per IP, the chance of losing all of them is higher and we shouldn't just quit if we don't have any response.

BUG=

Review URL: https://codereview.webrtc.org/1406223011

Cr-Commit-Position: refs/heads/master@{#10613}
2015-11-11 23:04:10 +00:00
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