ephemeral parent znodes

                 Key: ZOOKEEPER-723
                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-723
             Project: Zookeeper
          Issue Type: New Feature
            Reporter: Benjamin Reed

ephemeral znodes have the nice property of automatically cleaning up after 
themselves when the creator goes away, but since they can't have children it is 
hard to build subtrees that will cleanup after the clients that are using them 
are gone.

rather than changing the semantics of ephemeral nodes, i propose ephemeral 
parents: znodes that disappear when they have no more children. this cleanup 
would happen automatically when the last child is removed. an ephemeral parent 
is not tied to any particular session, so even if the creator goes away, the 
ephemeral parent will remain as long as there are children.

the when an ephemeral parent is created it will have an initial child, so that 
it doesn't get immediately removed. i think this child should be an ephemeral 
znode with a predefined name, "firstChild".

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