HDFS-5065. Change attribution in CHANGES.txt to version 2.2.1.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1537319 13f79535-47bb-0310-9956-ffa450edef68
YARN-1321. Changed NMTokenCache to support both singleton and an instance usage. Contributed by Alejandro Abdelnur.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1537334 13f79535-47bb-0310-9956-ffa450edef68
HDFS-4633. Change attribution in CHANGES.txt to version 2.2.1.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1537345 13f79535-47bb-0310-9956-ffa450edef68
YARN-1343. NodeManagers additions/restarts are not reported as node updates in AllocateResponse responses to AMs. (tucu)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1537368 13f79535-47bb-0310-9956-ffa450edef68