Updates to RemoteCacheManager and JniTest

RemoteCacheManager:
   Added missing isStarted() method
   Added constructor with URL and boolean
   Added constructor with boolean
   
JniTest:
   Add CacheManagerStoppedTest
   Add three commented out tests that get the "Failed to connect
Operation now in progress" error

Add RemoteCacheManagerNotStartedException to support
CacheManagerStoppedTest