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)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1532014 13f79535-47bb-0310-9956-ffa450edef68
MAPREDUCE-5546. Merging change r1532016 from trunk to branch-2.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1532017 13f79535-47bb-0310-9956-ffa450edef68