Restructure tests to never wait for no packets, Greatly increase wait timeout. (Reduce expectation of synchronous primitives precision) Bug: webrtc:8494 Change-Id: I9a80fda3a2bf527d8b7337ecabaf625e543b8c62 Reviewed-on: https://webrtc-review.googlesource.com/20502 Reviewed-by: Niels Moller <nisse@webrtc.org> Commit-Queue: Danil Chapovalov <danilchap@webrtc.org> Cr-Commit-Position: refs/heads/master@{#20584}