def generate_ha_group_id(self, context, router, port, ha_settings_db,<EOL>ha_group_uuid):
return None<EOL>
Returns None or a unique integer value for use as identifier of an
        HSRP, VRRP or GLBP group configuration.

        :param context: the neutron context of the request
        :param router: dictionary of HA router
        :param port: dictionary of port associated with the HA group
        :param ha_settings_db: db object with ha settings
        :param ha_group_uuid: uuid of HA group's DB entry

        :returns - an integer value group identifier or None

        If None is returned, an identifier will be generated in a non-driver
        specific manner.