YARN-1701. Improved default paths of the timeline store and the generic history store. Contributed by Tsuyoshi Ozawa.
svn merge --ignore-ancestry -c 1593481 ../../trunk/


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2.4@1593485 13f79535-47bb-0310-9956-ffa450edef68