HDFS-6265. Prepare HDFS codebase for JUnit 4.11. Contributed by Chris Nauroth.

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YARN-1970. Prepare YARN codebase for JUnit 4.11. Contributed by Chris Nauroth.

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HDFS-6178. Decommission on standby NN couldn't finish. Contributed by Ming Ma.

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MAPREDUCE-5852. Prepare MapReduce codebase for JUnit 4.11. Contributed by Chris Nauroth.

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