HDFS-6297. Add CLI testcases to reflect new features of dfs and dfsadmin (Contributed by Dasha Boudnik)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1601059 13f79535-47bb-0310-9956-ffa450edef68
YARN-2132. ZKRMStateStore.ZKAction#runWithRetries doesn't log the exception it encounters. (Vamsee Yarlagadda via kasha)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1601065 13f79535-47bb-0310-9956-ffa450edef68