YARN-1183. MiniYARNCluster shutdown takes several minutes intermittently (Andrey Klochkov via jeagles)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1534806 13f79535-47bb-0310-9956-ffa450edef68
svn commit -c 1534832 FIXES: MAPREDUCE-5561. org.apache.hadoop.mapreduce.v2.app.job.impl.TestJobImpl testcase failing on trunk. Contributed by Karthik Kambatla


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1534835 13f79535-47bb-0310-9956-ffa450edef68