YARN-467. Modify public distributed cache to localize files such that no local directory hits unix file count limits and thus prevent job failures. Contributed by Omkar Vinit Joshi.
svn merge --ignore-ancestry -c 1463823 ../../trunk/


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1463824 13f79535-47bb-0310-9956-ffa450edef68