Mainly an update of the BasicPortAllocator tests. Other code related to gturn may be deleted in a followup cl. Bug: None Change-Id: I72146c8faf30c1a9d03d320d75af91984f797a7e Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/153485 Commit-Queue: Niels Moller <nisse@webrtc.org> Reviewed-by: Qingsi Wang <qingsi@webrtc.org> Cr-Commit-Position: refs/heads/master@{#29275}