YARN-955. Implemented ApplicationHistoryProtocol handler. Contributed by Mayank Bansal.
svn merge --ignore-ancestry -c 1556743 ../YARN-321


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1562198 13f79535-47bb-0310-9956-ffa450edef68
YARN-1242. Changed yarn scripts to be able to start ApplicationHistoryServer as an individual process. Contributed by Mayank Bansal.
svn merge --ignore-ancestry -c 1556744 ../YARN-321


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1562199 13f79535-47bb-0310-9956-ffa450edef68