HADOOP-9291. enhance unit-test coverage of package o.a.h.metrics2 (Ivan A. Veselovsky via jeagles)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1534476 13f79535-47bb-0310-9956-ffa450edef68
YARN-1331. Merging change r1534499 from trunk to branch-2.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1534500 13f79535-47bb-0310-9956-ffa450edef68
YARN-1315. TestQueueACLs should also test FairScheduler (Sandy Ryza)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1534510 13f79535-47bb-0310-9956-ffa450edef68