ISPN-2657 Support for LevelDB CacheStore
Fixed pom.xml version for level DB cache store
ISPN-3216 NullPointerException when preload with AsyncStore in Transactional caches
Fix compilation error
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.
Adapt code for data placement

* changed from jmx attributes to jmx operations

* block also data placement requests
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.
Guard all the log accesses
ISPN-3241 Don't make the memcached server overwrite the cache configuraiton if it already exists
Bump to 5.2.8-cloudtm-SNAPSHOT
Fixed supress state transfer test