ZOOKEEPER-1573. Unable to load database due to missing parent node (Vinayakumar B via phunt, fpj)

git-svn-id: https://svn.apache.org/repos/asf/zookeeper/branches/branch-3.4@1566740 13f79535-47bb-0310-9956-ffa450edef68
ZOOKEEPER-1811. The ZooKeeperSaslClient service name principal is hardcoded to "zookeeper" (Harsh J via phunt)

git-svn-id: https://svn.apache.org/repos/asf/zookeeper/branches/branch-3.4@1566749 13f79535-47bb-0310-9956-ffa450edef68