Adding an initial spike of a M/S replicated leveldb store. Replication protocol is working nicely, just need automated M/S election bits.
Move tests in a test package.
Rename the HA* classes to DFS*.

git-svn-id: https://svn.apache.org/repos/asf/activemq/trunk@1476719 13f79535-47bb-0310-9956-ffa450edef68