ONOS-1721 - GUI -- Websocket Service unit tests written, topo nav glyph added, other minor improvements.

Change-Id: I8199024e884d8538cd7c7d891d4fb4c81541150d
diff --git a/web/gui/src/main/webapp/app/fw/svg/icon.js b/web/gui/src/main/webapp/app/fw/svg/icon.js
index e53fe2a..737a8a8 100644
--- a/web/gui/src/main/webapp/app/fw/svg/icon.js
+++ b/web/gui/src/main/webapp/app/fw/svg/icon.js
@@ -51,7 +51,7 @@
 
         nav_apps: 'bird',
         nav_cluster: 'node',
-        nav_topo: 'unknown', // TODO: need a topology glyph
+        nav_topo: 'topo',
         nav_devs: 'switch',
         nav_links: 'ports',
         nav_hosts: 'endstation',