Bugfix - track the right list of VLANs for the switch

Change-Id: Idf1207a4460b4cfb114d4ca811ecf43742c49a9a
diff --git a/util.py b/util.py
index f3bb99c..953bd71 100644
--- a/util.py
+++ b/util.py
@@ -747,7 +747,7 @@
         # Make sure this switch has all the VLANs we need
         for vlan in db.all_vlans():
             if vlan.tag is not state.config.vland.default_vlan_tag:
-                if not vlan.tag in new_vlan_tags:
+                if not vlan.tag in vlan_tags:
                     print "Adding VLAN tag %d to this switch" % (vlan.tag)
                     s.vlan_create(vlan.tag)
                     s.vlan_set_name(vlan.tag, vlan.name)