YARN-2424. LCE should support non-cgroups, non-secure mode (Chris Douglas via aw)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1619424 13f79535-47bb-0310-9956-ffa450edef68

Conflicts:
	hadoop-yarn-project/CHANGES.txt