Add /zookeeper/sessions/* to allow inspection/manipulation of client sessions

                 Key: ZOOKEEPER-829
             Project: Zookeeper
          Issue Type: New Feature
          Components: server
            Reporter: Todd Lipcon

For some use cases in HBase (HBASE-1316 in particular) we'd like the ability to 
forcible expire someone else's ZK session. Patrick and I discussed on IRC and 
came up with an idea of creating nodes in /zookeeper/sessions/<session id> that 
can be read in order to get basic stats about a session, and written in order 
to manipulate one. The manipulation we need in HBase is the ability to write a 
command like "kill", but others might be useful as well.

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