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Supply read-only=false flag when connecting#24

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GlenWalker wants to merge 1 commit intohuaban:masterfrom
GlenWalker:connect_read_only
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Supply read-only=false flag when connecting#24
GlenWalker wants to merge 1 commit intohuaban:masterfrom
GlenWalker:connect_read_only

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* Not a full implementation of read-only with read-only==true handling.
* Avoids the logging of a warning message whenever erlzk connects
  "Connection request from old client {}; will be dropped if server is in r-o mode"
  https://github.com/apache/zookeeper/blob/master/zookeeper-server/src/main/java/org/apache/zookeeper/server/ZooKeeperServer.java#L1403
* Server-side support for read-only added in ZooKeeper 3.4.0 (22 Nov 2011)
  https://issues.apache.org/jira/browse/ZOOKEEPER-784
  apache/zookeeper@9be9a3a1
* C client support for read-only added in ZooKeeper 3.5.0 (6 Aug 2014)
  https://issues.apache.org/jira/browse/ZOOKEEPER-827
  apache/zookeeper@dc40617c
* Backwards compatible with older servers
  https://cwiki.apache.org/confluence/display/HADOOP2/ZooKeeper+GSoCReadOnlyMode
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