Initial sketch of the GUI web-socket mechanics.

Change-Id: I5f481886fd45ce058be4aaf07fba466e702ae7ad
diff --git a/web/gui/src/main/webapp/WEB-INF/web.xml b/web/gui/src/main/webapp/WEB-INF/web.xml
index c5c6e28..ab7a550 100644
--- a/web/gui/src/main/webapp/WEB-INF/web.xml
+++ b/web/gui/src/main/webapp/WEB-INF/web.xml
@@ -39,4 +39,16 @@
         <url-pattern>/rs/*</url-pattern>
     </servlet-mapping>
 
+    <servlet>
+        <servlet-name>Web Socket Service</servlet-name>
+        <servlet-class>org.onlab.onos.gui.GuiWebSocketServlet</servlet-class>
+        <load-on-startup>2</load-on-startup>
+    </servlet>
+
+    <servlet-mapping>
+        <servlet-name>Web Socket Service</servlet-name>
+        <url-pattern>/ws/*</url-pattern>
+    </servlet-mapping>
+
+
 </web-app>
\ No newline at end of file