ZOOKEEPER-1731. Unsynchronized access to ServerCnxnFactory.connectionBeans results in 
  deadlock. (Dave Latham via camille)
  

git-svn-id: https://svn.apache.org/repos/asf/zookeeper/branches/branch-3.4@1509780 13f79535-47bb-0310-9956-ffa450edef68