svn merge -c 1612652 FIXES: MAPREDUCE-5963. ShuffleHandler DB schema should be versioned with compatible/incompatible changes. Contributed by Junping Du


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1612654 13f79535-47bb-0310-9956-ffa450edef68