NIFI-10148: Fixed bug in SwappablePriorityQueue, in which the Active …

[markap14]

…Queue Size could be decremented before the Unacknowledged Queue Size is incremented when FlowFiles are polled. This can result in the SwappablePrioriotyQueue incorrectly returning a value of true from the isEmpty() method. Additionally, updated the NiFiSystemIT so that if waiting for a particular queue size we periodically log size of all queues, which aids in debugging, and added necessary methods to FlowClient to make that happen.

Summary

NIFI-00000

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[exceptionfactory]

Thanks for tracking down this issue @markap14, the changes look good! +1 merging