reclass/storage/system/openstack_gateway_single.yml

parameters:
  _param:
    openstack_gateway_node01_hostname: gtw01
  reclass:
    storage:
      node:
        openstack_gateway_node01:
          name: ${_param:openstack_gateway_node01_hostname}
          domain: ${_param:cluster_domain}
          classes:
          - cluster.${_param:cluster_name}.openstack.gateway
          params:
            salt_master_host: ${_param:reclass_config_master}
            linux_system_codename: trusty
            single_address: ${_param:openstack_gateway_address}