HADOOP-8731. Fixed TrackerDistributedCacheManager to address failure in the test TestTrackerDistributedCacheManager on Windows. Contributed by Ivan Mitic.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-1-win@1466705 13f79535-47bb-0310-9956-ffa450edef68