Simon Willnauer d5fa84f869 Harder close and remove reference concurrency in MockTcpTransport (#22613)
There was still small race in MockTcpTransport where channesl that are concurrently
closing are not yet removed from the reference tracking causing tests to fail. Compared to
the other races before this is a rather small windown and requires very very short test durations.
2017-01-13 16:04:05 +01:00
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