YARN-2251. Avoid negative elapsed time in JHS/MRAM web UI and services (Contributed by Zhijie Shen)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1607833 13f79535-47bb-0310-9956-ffa450edef68
YARN-2250. FairScheduler.findLowestCommonAncestorQueue returns null when queues not identical (Krisztian Horvath via Sandy Ryza)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1607872 13f79535-47bb-0310-9956-ffa450edef68