c client watcher objects can lose events
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                 Key: ZOOKEEPER-138
                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-138
             Project: Zookeeper
          Issue Type: Bug
          Components: c client
    Affects Versions: 3.0.0
            Reporter: Patrick Hunt
            Assignee: Mahadev konar
             Fix For: 3.0.0


if a single watcher (A) is registered on a single node for both a getdata and 
exists watch the second watch event may be lost:

1) getdata("node", A)
2) setdata("node"...)
3) exists("node", A)
4) delete("node"...)

if watch events for 2 is processed on the client (zookeeper.java, zkwatcher) 
after 3 completes then the zkwatcher process event method will clear the watch 
and the subsequent operation's (4) event will be ignored

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