HDFS-6657. Remove link to 'Legacy UI' in trunk's Namenode UI. Contributed by Vinayakumar B.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1613195 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-10894. Fix dead link in ToolRunner documentation. (Contributed by Akira Ajisaka)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1613200 13f79535-47bb-0310-9956-ffa450edef68
HDFS-6723. New NN webUI no longer displays decommissioned state for dead node. Contributed by Ming Ma.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1613220 13f79535-47bb-0310-9956-ffa450edef68