L7 (application layer) ping support

                 Key: ZOOKEEPER-920
                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-920
             Project: Zookeeper
          Issue Type: New Feature
          Components: c client
    Affects Versions: 3.3.1
            Reporter: Chang Song
            Priority: Minor

Zookeeper is used in applications where fault tolerance is important. Its 
client i/o thread send/recv heartbeats to/fro Zookeeper ensemble to stay 
connected. However healthy heartbeat does not always means that the application 
that uses Zookeeper client is in good health, it only means that ZK client 
thread is in good health.

This I needed something that can tagged onto Zookeeper ping that represents L7 
(application) health as well.
I have modified C client source to support this in minimal way. I am new to 
Zookeeper, so please code review this code.  I am actually using this code in 
our in-house solution.


Thank you very much.

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