YARN-1590. Fixed ResourceManager, web-app proxy and MR JobHistoryServer to expand _HOST properly in their kerberos principles. Contributed by Mohammad Kamrul Islam.
svn merge --ignore-ancestry -c 1569537 ../../trunk/


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Update change description for HDFS-5953

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1569580 13f79535-47bb-0310-9956-ffa450edef68
Merge from r1569585. YARN-1428. Fixed RM to write the final state of RMApp/RMAppAttempt to the application history store in the transition to the final state. (Contributed by Zhijie Shen)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1569600 13f79535-47bb-0310-9956-ffa450edef68