svn merge -c 1443027. FIXES: MAPREDUCE-4905. test org.apache.hadoop.mapred.pipes (Aleksey Gorshkov via bobby)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2.0.3-alpha@1443126 13f79535-47bb-0310-9956-ffa450edef68