ISPN-4490 Members can miss the rebalance cancellation on coordinator change

Simulate the rebalance cancellation in StateTransferManagerImpl.
ISPN-4496 EncryptProtocolIT shouldn't check passwords via JMX
Replace ignore tests with empty test to avoid false alarms
Change ReplicatedCHFactory to only replace leavers in updateMembers()

Uneven primary ownership should be dealt with in rebalance() only.
Delegate the isBalanced() check in DefaultRebalancePolicy to the CH factory

Allows waitForRehashToComplete() to work even if the CH factory allocated
less than numOwners owners to each segment.