Clean up FSDatasetInterface
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Key: HDFS-3082
URL: https://issues.apache.org/jira/browse/HDFS-3082
Project: Hadoop HDFS
Issue Type: Sub-task
Components: data-node
Reporter: Tsz Wo (Nicholas), SZE
Assignee: Tsz Wo (Nicholas), SZE
Some methods defined in FSDatasetInterface are actually not needed.
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