Add issuer field to delegation tokens
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Key: HADOOP-7541
URL: https://issues.apache.org/jira/browse/HADOOP-7541
Project: Hadoop Common
Issue Type: New Feature
Components: security
Reporter: Daryn Sharp
Assignee: Daryn Sharp
Fix For: 0.20.205.0
Tokens currently lack traceability to its issuer. This complicates the ability
to reliably renew tokens. Tokens should have an optional issuer.
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