ISPN-2657 Support for LevelDB CacheStore
ISPN-3216 NullPointerException when preload with AsyncStore in Transactional caches
ISPN-3130 introduced a random failure in StateConsumerTest
ISPN-3140 JMX operation to suppress state transfer

Make LocalTopologyManagerImpl a MBean and add a RebalancingEnabled
JMX attribute to suppress/enable rebalancing in the cluster from any node.
If the coordinator dies, however, the new coordinator will not remember
if rebalancing was suppressed on the old coordinator.