YARN-786: Addendum so that RMAppAttemptImpl#getApplicationResourceUsageReport won't return null

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HDFS-1386. TestJMXGet fails in jdk7 (jeagles)

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YARN-1407. RM Web UI and REST APIs should uniformly use YarnApplicationState (Sandy Ryza)

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Move YARN-1407 under 2.2.1 in CHANGES.txt

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