Before running each shell command, check zk session and if not present,
reestablish it
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Key: HBASE-3645
URL: https://issues.apache.org/jira/browse/HBASE-3645
Project: HBase
Issue Type: Improvement
Components: shell
Reporter: stack
Dmitriy was getting whack responses from his shell... NoSuchMethodException,
etc., and it turned out that it was a long running shell that had run over a
cluster restart. We should at least fail if we've lost our zk session or
reconnect.
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