ISPN-3205 Upgrade to JGroups 3.3.1.Final
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.