YARN-1490. Introduced the ability to make ResourceManager optionally not kill all containers when an ApplicationMaster exits. Contributed by Jian He.
svn merge --ignore-ancestry -c 1557143 ../../trunk/


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1557144 13f79535-47bb-0310-9956-ffa450edef68