add default visualisation config in example config file

Disabled by default

Change-Id: I51394d29711f8ff89307dd26e3c8e999d66a3267
diff --git a/vland.cfg b/vland.cfg
index 6315258..d595e1d 100644
--- a/vland.cfg
+++ b/vland.cfg
@@ -11,6 +11,10 @@
 port = 3080
 #default_vlan_tag = 1
 
+[visualisation]
+enabled = False
+port = 3081
+
 [switch vlandswitch01]
 name = vlandswitch01
 driver = CiscoCatalyst