HDFS-5342. Merge change r1532090 from trunk.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1532092 13f79535-47bb-0310-9956-ffa450edef68
YARN-1259. In Fair Scheduler web UI, queue num pending and num active apps switched. (Robert Kanter via Sandy Ryza)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1532096 13f79535-47bb-0310-9956-ffa450edef68
YARN-1182. MiniYARNCluster creates and inits the RM/NM only on start() (Karthik Kambatla via Sandy Ryza)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1532113 13f79535-47bb-0310-9956-ffa450edef68