Bug-1607:  Clustering : Remove actorFor (deprecated) call from TransactionProxy.java

1. Changes to use ActorSelection instead of ActorPath
2. Removed actorFor usage
3. Removed resolvePath calls
4. Changes in test classes.

Rebased.

Change-Id: I8fdc18a1ac18d75d1b6d5c8cd0da986e19d08280
Signed-off-by: Kamal Rameshan <kramesha@cisco.com>