Add NOOP comment in the test code for adding trunks to VLANs

Change-Id: I5e774001fec51c839ad4ac0857cd40a483e35322
diff --git a/drivers/NetgearXSM.py b/drivers/NetgearXSM.py
index e3896b1..3a49f1f 100644
--- a/drivers/NetgearXSM.py
+++ b/drivers/NetgearXSM.py
@@ -775,6 +775,8 @@
     print "Read from switch: which VLANs is 1/0/9 on?"
     buf = p.port_get_trunk_vlan_list("1/0/9")
     p.dump_list(buf)
+    
+    # The adds below are NOOPs in effect on this switch
     print "Add 1/0/9 to VLAN 2"
     p.port_add_trunk_to_vlan("1/0/9", 2)
     print "Add 1/0/9 to VLAN 3"