ZOOKEEPER-1576. Zookeeper cluster - failed to connect to cluster if one of the 
  provided IPs causes java.net.UnknownHostException (Edward Ribeiro via camille)


git-svn-id: https://svn.apache.org/repos/asf/zookeeper/trunk@1606254 13f79535-47bb-0310-9956-ffa450edef68