YARN-2436. [post-HADOOP-9902] yarn application help doesn't work


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1619603 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-10893. isolated classloader on the client side. Contributed by Sangjin Lee


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1619604 13f79535-47bb-0310-9956-ffa450edef68