HDFS-6214.  Webhdfs has poor throughput for files >2GB (daryn)


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1587954 13f79535-47bb-0310-9956-ffa450edef68
HDFS-6219. Proxy superuser configuration should use true client IP for address checks. Contributed by Daryn Sharp.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1587962 13f79535-47bb-0310-9956-ffa450edef68
fix CHANGES.txt.

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