When create node is request throws exception, the node could still be created 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
(cherry picked from commit 7d413590b4808df2d48ec8d17de3a035b4c62bc3)