HDFS-5690. DataNode fails to start in secure mode when dfs.http.policy equals to HTTP_ONLY. Contributed by Haohui Mai.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1553167 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-10175. Har files system authority should preserve userinfo. Contributed by Chuan Liu.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1553169 13f79535-47bb-0310-9956-ffa450edef68
Merge remote-tracking branch: upstream/trunk