HADOOP-10665. Make Hadoop Authentication Handler loads case in-sensitive (Contributed by Benoy Antony)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1605049 13f79535-47bb-0310-9956-ffa450edef68
HDFS-6486. Add user doc for XAttrs via WebHDFS. Contributed by Yi Liu.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1605062 13f79535-47bb-0310-9956-ffa450edef68
YARN-2195. Clean a piece of code in ResourceRequest. Contributed by Wei Yan.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1605083 13f79535-47bb-0310-9956-ffa450edef68