ISPN-4521 ReplicationQueueTest.testReplicationQueueMultipleThreads
random failures

* Updated test to use proper assertions
* Changed test to use eventually
* Changed test threading to use thread pool
ISPN-4548 Revamped AbstractIninfispanTest threading handling.

* Also fixed up erroneous use of CountDownLatch to try to have threads
* run at the same time.
ISPN-4597 Include test verifying correct semantics during an XA transaction