Compare the default_vlan_tag to vlan.tag

Previous fix was buggy and rushed.

Change-Id: Ied61a46973135908e26ce8324c06a51fa64dcfa9
diff --git a/util.py b/util.py
index e537256..271ee88 100644
--- a/util.py
+++ b/util.py
@@ -505,7 +505,7 @@
                 else:
                     vlans = db.all_vlans()
                     for vlan in vlans:
-                        if vlan != state.config.vland.default_vlan_tag:
+                        if vlan.tag != state.config.vland.default_vlan_tag:
                             s.port_add_trunk_to_vlan(port.name, vlan.tag)
 
         except IOError: