HDFS-6078. TestIncrementalBlockReports is flaky. (Arpit Agarwal)

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Remove extra file from HDFS-3405.

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Revert HDFS-3405 for recommit with correct renamed files

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HDFS-3405. Checkpointing should use HTTP POST or PUT instead of GET-GET to send merged fsimages. Contributed by Vinayakumar B.

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