Create a package and individual class files for DataTransferProtocol
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Key: HDFS-2066
URL: https://issues.apache.org/jira/browse/HDFS-2066
Project: Hadoop HDFS
Issue Type: Sub-task
Reporter: Tsz Wo (Nicholas), SZE
{{DataTransferProtocol}} contains quite a few classes. It is better to create
a package and put the classes into individual files.
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