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/trunk@1534474 13f79535-47bb-0310-9956-ffa450edef68
YARN-1331. yarn.cmd exits with NoClassDefFoundError trying to run rmadmin or logs. Contributed by Chris Nauroth.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1534499 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/trunk@1534508 13f79535-47bb-0310-9956-ffa450edef68