Allow ephemeral znodes to have children created only by the owner session. 

                 Key: ZOOKEEPER-834
             Project: Zookeeper
          Issue Type: New Feature
          Components: c client, java client, server
            Reporter: Andrei Savu
             Fix For: 3.4.0

Ephemeral znodes are automatically removed when the client session is closed or 
expires and this behavior makes them very useful when you want to publish 
status information from active / connected clients. 

But there is a catch. Right now ephemerals can't have children znodes and 
because of that clients need to serialize status information as byte strings. 
This serialization renders that information almost invisible to generic 
zookeeper clients and hard / inefficient to update. 

Most of the time the status information can be expressed as a bunch of (key, 
value) pairs and we could easily store that using child znodes. Any ZooKeeper 
client can read that info without the need to reverse the serialization process 
and we can also easily update it. 

I suggest that the server should allow the ephemeral znodes to have children 
znodes. Each child should also be an ephemeral znode owned by the same session 
- parent ephemeralOwner session.

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