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
BZ1104045 ISPN-4154 Cancelled segment transfer causes future entry transfer to be ignored

Stop tracking keys when a new coordinator cancels the state transfer.