HBASE-3065 recoverable ZooKeeper, the new metadata introduced setData call 
breaks old hbase client.
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                 Key: HBASE-5106
                 URL: https://issues.apache.org/jira/browse/HBASE-5106
             Project: HBase
          Issue Type: Bug
    Affects Versions: 0.92.0, 0.94.0
            Reporter: Jimmy Xiang


Old hbase client which talks to the new hbase server could not understand the 
new metadata.  We should re-think how to check setData BADVERSION error.

How about we check the full actual data?  If the actual data in ZK is what we 
want to set, then we are good.  Of course, this data could be set actually by 
someone else, in this case, is it safe not to throw a KeeperException?

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