ENG-682 No special handling for caches destroyed during rejoin: the ToolkitCache will handle it
Retry read locking cache entities
Fix race in read locking cache manager entity -> check it still exists after getting the lock

git-svn-id: http://svn.terracotta.org/svn/ehcache@8489 b9324663-ca0f-0410-8574-be9b3887307d