allow configuration of session timeout min/max bounds

                 Key: ZOOKEEPER-601
             Project: Zookeeper
          Issue Type: Improvement
          Components: server
    Affects Versions: 3.2.1
            Reporter: Patrick Hunt
             Fix For: 3.3.0

ZK servers currently enforce a min/max boundary on client session timeout 
relative to the ticktime setting, detailed here:

In general there are good reasons for this however in some cases, in particular 
with HBase region servers, we have seen a need to allow this bound to be set 
differently (higher). The Sun jvm can GC pause for very long times (in some 
cases we've seen 4 minutes even with the "realtime" gc.

It would be good to allow this bound to be set via configuration parameters. 

Note: 4letterword and JMX integration would be needed.

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