try to relogin in a case of  failed RPC connection (expired tgt) only in case 
the subject is loginUser or proxyUgi.realUser.
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                 Key: HADOOP-6638
                 URL: https://issues.apache.org/jira/browse/HADOOP-6638
             Project: Hadoop Common
          Issue Type: Bug
            Reporter: Boris Shkolnik


when we get javax.security.sasl.SaslException in Client.setupSaslConnection() 
one possible problem could be an expired TGT.
So we try to relogin from the keytab. But this should be attempted ONLY in case 
of loginUser or proxyUgi.realUser trying to connect.

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