ISPN-2534 Some tests are not picked up by Surefire

Rename tests not ending in Test and add @Test annotation with the
appropriate group to base test classes.
ISPN-2534 Fix JdbcStringBasedCacheStoreAltMapperTest and JdbcStringBasedCacheStoreVamAltMapperTest
ISPN-2534 Fix clustered tx tests
ISPN-2620 A segment can end up in two different InboundTransferTasks

Exceptions are not handled properly when requesting transactions/data,
and because of this it's possible to "half-add" a segment.
ISPN-2620 A segment can end up in two different InboundTransferTasks

Synchronize on the cache status object while broadcasting the CH_UPDATE
command, thus ensuring the CH_UPDATE/REBALANCE_START commands arrive in the
right sequence on all the nodes.
ISPN-2666 StateTransferPessimisticTest.testStateTransfer fails randomly

Change TestingUtil.waitForRehashToComplete to wait for all the nodes to
finish the rebalance. (Particularly to remove the entries that they no
longer own.)