HDFS-4567. Webhdfs does not need a token for token operations. Contributed by Daryn Sharp.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1454460 13f79535-47bb-0310-9956-ffa450edef68
HDFS-4571. WebHDFS should not set the service hostname on the server side. (tucu)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1454475 13f79535-47bb-0310-9956-ffa450edef68
HDFS-4577. Webhdfs operations should declare if authentication is required. Contributed by Daryn Sharp.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1454517 13f79535-47bb-0310-9956-ffa450edef68