YARN-1258: Move to 2.2.1 in CHANGES.txt

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1534307 13f79535-47bb-0310-9956-ffa450edef68
Reverting "YARN-1258: Move to 2.2.1 in CHANGES.txt" because it contained unintended changes

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YARN-1258: Move to 2.2.1 in CHANGES.txt

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YARN-1288. Make Fair Scheduler ACLs more user friendly (Sandy Ryza)

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HDFS-5382. Implement the UI of browsing filesystems in HTML 5 page. Contributed by Haohui Mai.

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HDFS-5347. Add HDFS NFS user guide. Contributed by Brandon Li

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