enable faster timeout of sessions in case of unexpected socket disconnect

                 Key: ZOOKEEPER-922
                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-922
             Project: Zookeeper
          Issue Type: Improvement
          Components: server
            Reporter: Camille Fournier

In the case when a client connection is closed due to socket error instead of 
the client calling close explicitly, it would be nice to enable the session 
associated with that client to time out faster than the negotiated session 
timeout. This would enable a zookeeper ensemble that is acting as a dynamic 
discovery provider to remove ephemeral nodes for crashed clients quickly, while 
allowing for a longer heartbeat-based timeout for java clients that need to do 
long stop-the-world GC. 

I propose doing this by setting the timeout associated with the crashed session 
to "minSessionTimeout".

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