Fix flaky tests and race conditions #403
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Fix a race condition in TestPartitionReplicationRequestLoopPreempt which caused the test to sporadically fail. This was caused by a race between a NATS subscription getting created and a message getting published. This is fixed by adding a flush call after subscribing.
Also fix selectGroupCoordinator logic to select based on group coordinator load.
Clarify the purpose of the anonymous function.
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Also resolve some race conditions related to server shutdown which was causing tests to deadlock on occasion.