MAPREDUCE-5351. JobTracker memory leak caused by CleanupQueue reopening FileSystem. Contributed by Sandy Ryza.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-1-win@1525775 13f79535-47bb-0310-9956-ffa450edef68
MAPREDUCE-5508. JobTracker memory leak caused by unreleased FileSystem objects in JobInProgress#cleanupJob. Contributed by Xi Fang.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-1-win@1525790 13f79535-47bb-0310-9956-ffa450edef68