Pass VNC server name in options.

lib/units/device/plugins/vnc/index.js

@@ -20,9 +20,13 @@ module.exports = syrup.serial()
     function createServer() {
       log.info('Starting VNC server on port %d', options.vncPort)
 
+      var opts = {
+        name: options.serial
+      }
+
       var vnc = new VncServer(net.createServer({
         allowHalfOpen: true
-      }))
+      }), opts)
 
       var listeningListener, errorListener
       return new Promise(function(resolve, reject) {