Disable some PortAllocatorTest on tsan due to flakiness

TBR=kjellander@webrtc.org
BUG=4743

Review URL: https://codereview.webrtc.org/1160033005

Cr-Original-Commit-Position: refs/heads/master@{#9369}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 491bd534ef726456883ec372562d1c8fef82e7ca
1 file changed