svn merge -c 1509401 FIXES: MAPREDUCE-5428.  HistoryFileManager doesn't stop threads when service is stopped. Contributed by Karthik Kambatla


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1509404 13f79535-47bb-0310-9956-ffa450edef68