Use -- in order to prevent argparse to handle removed VLAN as arguments

        if name in self.hypervisor.domains:

            if mac_address is None:

                rcode, output = execute(self.main, [self.main.config.vlan_script,

                                                    name, vlan_update_format])

                                                    name, '--', vlan_update_format])

            else:

                rcode, output = execute(self.main, [self.main.config.vlan_script,

                                                    '--iface-macaddr', mac_address,

                                                    name, vlan_update_format])

                                                    name, '--', vlan_update_format])

            if rcode != 0:

                raise RuntimeError(output.strip().split('\n')[-1].strip())

        else: