topology ui: show vendor names in switch view

src/main/resources/web/tpl/switch-list-item.html

-		<td><a href="/switch/<%= id %>"><%= id %></a></td><td><%= packetCount %></td><td><%= byteCount %></td><td><%= flowCount %></td>
+<td><a href="/switch/<%= id %>"><%= id %></a></td><td><%= manufacturerDescription %><td><%= packetCount %></td><td><%= byteCount %></td><td><%= flowCount %></td>

src/main/resources/web/tpl/switch-list.html

@@ -4,7 +4,7 @@
 	<h1>Switches (<%= nswitches %>)</h1>
 </div>
 <table class="table striped-table switch-table">
-	<thead><tr><th>DPID</th><th>Packets</th><th>Bytes</th><th>Flows</th></tr></thead>
+    <thead><tr><th>DPID</th><th>Vendor</th><th>Packets</th><th>Bytes</th><th>Flows</th></tr></thead>
 	<tbody>
 		<!-- switches will be inserted here by SwitchListView:render -->
 	</tbody>