ISPN-3530 ISPN-1855 Keep per-cache CH to route requests correctly

* fixed HotRodManagerIT tests: cannot pass null as cache name
ISPN-4472 Upgrade TestNG from 6.8 to 6.8.8
ISPN-3729 Minimize the number of moved segments for SyncConsistentHashFactory

Based on the original consistent hashing paper, the
NewSyncConsistentHashFactory algorithm doesn't move any segments at all.