MAPREDUCE-2817. MiniRMCluster hardcodes 'mapred.local.dir' configuration to 'build/test/mapred/local'. (rkanter via tucu)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-1@1464221 13f79535-47bb-0310-9956-ffa450edef68