Move YARN-1284 from 2.3 to 2.2.1 in CHANGES.txt

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1531424 13f79535-47bb-0310-9956-ffa450edef68
YARN-1300. SLS tests fail because conf puts YARN properties in fair-scheduler.xml (Ted Yu via Sandy Ryza)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1531427 13f79535-47bb-0310-9956-ffa450edef68