NPE if renewer is passed as null in getDelegationToken
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                 Key: HADOOP-6620
                 URL: https://issues.apache.org/jira/browse/HADOOP-6620
             Project: Hadoop Common
          Issue Type: Bug
            Reporter: Jitendra Nath Pandey


If renewer is passed as null in getDelegationToken, an NPE is thrown. We should 
handle null renewer and the token must not be allowed to be renewed if the 
renewer is null or empty string.

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