MAPREDUCE-2067.  Distinct minicluster services (e.g. NN and JT) overwrite each other's service policies.  Contributed by Aaron T. Myers.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/mapreduce/trunk@1002905 13f79535-47bb-0310-9956-ffa450edef68
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