danilchap bcb6004a9d Fix flaky EndToEndTest.TransportSeqNumOnAudioAndVideo
Add extra checks to it to simplify diagnostic should it fail again.

BUG=webrtc:7292

Review-Url: https://codereview.webrtc.org/2728103002
Cr-Commit-Position: refs/heads/master@{#16999}
2017-03-03 12:38:11 +00:00
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