when renewing/canceling DelegationToken over http we need to pass exception
information back to the caller.
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Key: HDFS-1860
URL: https://issues.apache.org/jira/browse/HDFS-1860
Project: Hadoop HDFS
Issue Type: Bug
Reporter: Boris Shkolnik
Current implementation is not using XML for that, so we will pass it as a part
of response message.
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