routing, gateways. add function to return "down" gateways and remove now unused validate_address_family(), for https://github.com/opnsense/core/issues/2279
routing, gateways. add function to return "down" gateways and remove now unused validate_address_family(), for https://github.com/opnsense/core/issues/2279

opnsense/core,opnsense/core,opnsense/core,opnsense/core,opnsense/core,opnsense/core