ISPN-4938 Infinispan Commons Util package is not in generated Javadoc

* Also fixed import in interface
ISPN-4886 SingleNodeJdbcStoreIT.testForcedShutdown and
testNormalShutdown random failures

* Made sure we put the same byte as the test consistently
JavaDoc: multiline code examples are mangled
ISPN-4873 Statetransfer thread pool deadlock

* Update LargeClusterStressTest to create a large number of caches
* Make StateRequestCommand implement TopologyAffectedCommand
ISPN-4941 Re-enabling rebalancing should not start a rebalance for a cache
in degraded mode