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.
Bump to 5.2.7-SNAPSHOT
ISPN-3140 JMX operation to suppress state transfer

Broadcast the rebalance suspend/enable requests, so that when the
coordinator dies, the new coordinator would keep the same status.
ISPN-3241 Don't make the memcached server overwrite the cache configuraiton if it already exists
Bump to 5.2.8-SNAPSHOT