g/c DEAD_VLAN_TAG

Change-Id: If29f734246fd70dc3924d512a972dcdaa06dd4df
missing normalized_port_name

Change-Id: I9ac7cc1e35205bddc64e7865c45e801df8cd6b33
port_unbound: simplify

Change-Id: Ied7555dd8433be7f1df8501f42f25f561dabea8f
port_bound: update a comment

Change-Id: Ia393f8cbeafe03455b8f75302c71365fcd75a51e