HDFS-3794. WebHDFS Open used with Offset returns the original (and incorrect) Content Length in the HTTP Header. Contributed by Tsz Wo (Nicholas), SZE.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-1@1504973 13f79535-47bb-0310-9956-ffa450edef68