Comment 1 for bug 1217212

in neutron/extensions/firewall.py#L194
        'protocol': {'allow_post': True, 'allow_put': True,
                     'is_visible': True, 'default': None,
                     'convert_to': convert_protocol,
                     'validate': {'type:values': fw_valid_protocol_values}},
in python-neutronclient/neutronclient/neutron/v2_0/fw/firewallrule.py#L104
        parser.add_argument(
            '--protocol', choices=['tcp', 'udp', 'icmp'],
            required=True,
            help='protocol for the firewall rule')