HDFS-6793. Missing changes in HftpFileSystem when Reintroduce dfs.http.port / dfs.https.port in branch-2. Contributed by Juan Yu.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2.5.0@1615246 13f79535-47bb-0310-9956-ffa450edef68