ISPN-4651 LevelDB crashes JVM when stop() is called concurrently with write()
ISPN-263 Handle cluster partitions

* More documentation fixes
* Rename isAllDataAvailable to isMissingData
ISPN-4574 PartitionHandling: consider less than numOwners partitions

Merged PartitionHandlingStrategy with RebalancePolicy -> AvailabilityStrategy
ISPN-4574 PartitionHandling: consider less than numOwners partitions
Update ClusterCacheStatus and ClusterTopologyManagerImpl