HADOOP-9594 commons-math

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1541667 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-9594 commons-math

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1541668 13f79535-47bb-0310-9956-ffa450edef68
HDFS-5440. Merge change 1541665 from trunk.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1541671 13f79535-47bb-0310-9956-ffa450edef68
MAPREDUCE-5431 Missing pom dependency in MR-client

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1541680 13f79535-47bb-0310-9956-ffa450edef68
Merge remote branch 'origin/branch-2' into branch-2-gd