YARN-2107. Refactored timeline classes into o.a.h.y.s.timeline package. Contributed by Vinod Kumar Vavilapalli.
svn merge --ignore-ancestry -c 1598094 ../../trunk/


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1598095 13f79535-47bb-0310-9956-ffa450edef68