Need to check TGT and renew if needed when fetching delegation tokens using HFTP
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Key: HDFS-1584
URL: https://issues.apache.org/jira/browse/HDFS-1584
Project: Hadoop HDFS
Issue Type: Bug
Components: security
Reporter: Kan Zhang
Currently, there is no checking on TGT validity when calling getDelegationToken(). The TGT
may expire and the call will fail.
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