ZOOKEEPER-1754. Read-only server allows to create znode (Rakesh R via fpj)



git-svn-id: https://svn.apache.org/repos/asf/zookeeper/branches/branch-3.4@1524247 13f79535-47bb-0310-9956-ffa450edef68
ZOOKEEPER-1751. ClientCnxn#run could miss the second ping or connection get dropped before a ping. (Jeffrey Zhong  via mahadev)

git-svn-id: https://svn.apache.org/repos/asf/zookeeper/branches/branch-3.4@1524274 13f79535-47bb-0310-9956-ffa450edef68