TokenCache should only call getDelegationToken if getDelegationTokens does not
return valid tokens
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Key: MAPREDUCE-3455
URL: https://issues.apache.org/jira/browse/MAPREDUCE-3455
Project: Hadoop Map/Reduce
Issue Type: Bug
Components: mrv2
Affects Versions: 0.23.0
Reporter: Siddharth Seth
Currently getDelegationToken is called irrespective of whether
getDelegationTokens gives back valid tokens.
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