ISPN-4733 Investigate potential issues with System.nanoTime() overflow

* Fixed TestingUtil calculation for when to stop trying
* Changed stats to not error if nanotime is -1 (extreme edge case)
* Also fixed TransactionTable when clearing old txs
ISPN-4760 Cluster registry doesn't work when rebalancing is disabled

* Rebalancing should always be enabled for the cluster registry cache
* Fix StateTransferSuppressIT