HADOOP-10040. Merging change r1531977 from trunk to branch-2.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1531978 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-10040. Merging change r1531983 from trunk to branch-2.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1531984 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-10040. Merging change r1531994 from trunk to branch-2.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1531996 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-9494. Excluded auto-generated and examples code from clover reports (Andrey Klochkov via jeagles)

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MAPREDUCE-5546. Merging change r1532016 from trunk to branch-2.

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HDFS-5342. Merge change r1532090 from trunk.

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YARN-1259. In Fair Scheduler web UI, queue num pending and num active apps switched. (Robert Kanter via Sandy Ryza)

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