Merged revision(s) 1611538 from hadoop/common/trunk:
HDFS-6655. Add 'header banner' to 'explorer.html' also in Namenode UI ( Contributed by Vinayakumar B )


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1611539 13f79535-47bb-0310-9956-ffa450edef68