HDFS-13581. DN UI logs link is broken when https is enabled. Contributed by Shashikant Banerjee.

(cherry picked from commit 0ce6290de6a08beab01cb5184d366d97c9abd811)

hadoop-hdfs-project/hadoop-hdfs/src/main/webapps/datanode/datanode.html

@@ -36,7 +36,7 @@
     <li class="dropdown">
       <a href="#" class="dropdown-toggle" data-toggle="dropdown">Utilities <b class="caret"></b></a>
       <ul class="dropdown-menu">
-        <li><a href="logs">Logs</a></li>
+        <li><a href="logs/">Logs</a></li>
       </ul>
     </li>
   </ul>