HADOOP-9336. Allow UGI of current connection to be queried. Contributed by Daryn Sharp.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1451376 13f79535-47bb-0310-9956-ffa450edef68
YARN-406. Fix TestRackResolver to function in networks where "host1" resolves to a valid host. Contributed by Hitesh Shah.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1451391 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-9349. Confusing output when running hadoop version from one hadoop installation when HADOOP_HOME points to another. (sandyr via tucu)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1451448 13f79535-47bb-0310-9956-ffa450edef68
MAPREDUCE-4896. mapred queue -info spits out ugly exception when queue does not exist. (sandyr via tucu)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1451452 13f79535-47bb-0310-9956-ffa450edef68