YARN-984. Renamed the incorrectly named applicationhistoryservice.records.pb.impl package to be applicationhistoryservice.records.impl.pb. Contributed by Devaraj K.
svn merge --ignore-ancestry -c 1556693 ../YARN-321


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1562162 13f79535-47bb-0310-9956-ffa450edef68