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YARN-978. Created ApplicationAttemptReport. Contributed by Mayank Bansal.
svn merge --ignore-ancestry -c 1556720 ../YARN-321
git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1562177 13f79535-47bb-0310-9956-ffa450edef68