YARN-979. Added more APIs for getting information about ApplicationAttempts and Containers from ApplicationHistoryProtocol. Contributed by Mayank Bansal and Zhijie Shen.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/YARN-321@1556731 13f79535-47bb-0310-9956-ffa450edef68