Commonize token selectors with fallback behavior
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Key: HDFS-3289
URL: https://issues.apache.org/jira/browse/HDFS-3289
Project: Hadoop HDFS
Issue Type: Improvement
Components: hdfs client, security
Affects Versions: 0.24.0
Reporter: Daryn Sharp
Priority: Minor
{{WebHdfsDelegationTokenSelector}} and {{HftpDelegationTokenSelector}} are
essentially the same. They could be refactored to a new class in
org.apache.hadoop.hdfs.security.token.delegation (or an inner class in
DelegationTokenSelector) and then pass TOKEN_KIND in the constructor. The
selector should look for the given kind, and if not found, fallback to looking
for the hdfs/rpc token.
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