When create node is request throws exception, the node could still be cr...

...eated in zookeeper database. So subsequent request to create the node would return NodeExists error. To handle this error, validate the node content against the data passed to created node. IF the create_node is requested without any data, allocate unique(uuid) and use it for create node. Sanity result: http://10.204.216.50/Docs/logs/0000_2014_03_29_17_33_26/test_report.html