Move utilities to DFSUtil
-------------------------
Key: HDFS-2161
URL: https://issues.apache.org/jira/browse/HDFS-2161
Project: Hadoop HDFS
Issue Type: Improvement
Reporter: Tsz Wo (Nicholas), SZE
Assignee: Tsz Wo (Nicholas), SZE
Utilities include
- {{createNamenode(..)}}, {{createClientDatanodeProtocolProxy(..)}};
- {{stringifyToken(..)}}; and
- {{Random}} object.
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