ISPN-2581 Create unit test for state transfer completion

* Proove that config option StateTransferConfiguration.awaitInitialTransfer()
is honored correctly.
* Removed dead code.
* Log exceptions encountered during command execution as errors
ISPN-2670 Test Hot Rod client now supports protocol version 1.2
ISPN-2755 Filter the table prefix for inappropriate characters
ISPN-2754 Fix the infinispan-config-5.2.xsd schema to allow multiple "external" stores (i.e. declared in other schemas)