Merged revision(s) 1605049 from hadoop/common/trunk:
HADOOP-10665. Make Hadoop Authentication Handler loads case in-sensitive (Contributed by Benoy Antony)
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Merge from trunk. HDFS-6486. Add user doc for XAttrs via WebHDFS. Contributed by Yi Liu.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1605063 13f79535-47bb-0310-9956-ffa450edef68
YARN-2195. Clean a piece of code in ResourceRequest. Contributed by Wei Yan.

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