YARN-617. Made ContainerTokens to be used for validation at NodeManager also in unsecure mode to prevent AMs from faking resource requirements in unsecure mode. Contributed by Omkar Vinit Joshi.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1483667 13f79535-47bb-0310-9956-ffa450edef68