MAPREDUCE-5554. hdfs-site.xml included in hadoop-mapreduce-client-jobclient tests jar is breaking tests for downstream components (Robert Kanter via Sandy Ryza)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1528647 13f79535-47bb-0310-9956-ffa450edef68