ACCUMULO-1049 modified master to stop locking tserver nodes and just monitor  tserver nodes in zookeeper

git-svn-id: https://svn.apache.org/repos/asf/accumulo/trunk@1444259 13f79535-47bb-0310-9956-ffa450edef68
ACCUMULO-635 ACCUMULO-1010 got basic upgrade and upgrade test script working... 

git-svn-id: https://svn.apache.org/repos/asf/accumulo/trunk@1444313 13f79535-47bb-0310-9956-ffa450edef68