HDFS-5570. Deprecate hftp / hsftp and replace them with webhdfs / swebhdfs. Contributed by Haohui Mai.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1584100 13f79535-47bb-0310-9956-ffa450edef68
HDFS-5570. Addendum commit for r1584100.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1584174 13f79535-47bb-0310-9956-ffa450edef68