HADOOP-8440. Merging change r1501424 from trunk to branch-2.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1501435 13f79535-47bb-0310-9956-ffa450edef68
HDFS-4951. FsShell commands using secure httpfs throw exceptions due to missing TokenRenewer. (rknater via tucu)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1501452 13f79535-47bb-0310-9956-ffa450edef68