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

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HDFS-5440. Merge change 1541665 from trunk.

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MAPREDUCE-5431 Missing pom dependency in MR-client

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