ISPN-4565 ReplTotalOrderVersionedStateTransferTest.testStateTransfer ran...

...dom failures

* fix NPE:CommitCommand should not trigger the PrepareCommand.
* fix timeout: CacheTopologyControlCommand should be processed in the deliver thread

https://issues.jboss.org/browse/ISPN-4565
why do you say that? I always wrap the ```log.tracef()``` invocation with an ```if```