Adding no disk persistence option in zookeeper.

                 Key: ZOOKEEPER-866
             Project: Zookeeper
          Issue Type: New Feature
            Reporter: Mahadev konar
            Assignee: Mahadev konar
             Fix For: 3.4.0

Its been seen that some folks would like to use zookeeper for very fine grained 
locking. Also, in there use case they are fine with loosing all old zookeeper 
state if they reboot zookeeper or zookeeper goes down. The use case is more of 
a runtime locking wherein forgetting the state of locks is acceptable in case 
of a zookeeper reboot. Not logging to disk allows high throughput on and low 
latency on the writes to zookeeper. This would be a configuration option to set 
(ofcourse the default would be logging to disk).

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