Merge -c 1583241 from trunk to branch-2 to fix HDFS-4564. Ensure webhdfs returns correct HTTP response codes for denied operations. Contributed by Daryn Sharp.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1583242 13f79535-47bb-0310-9956-ffa450edef68