reclass/storage/system/opencontrail_gateway_single.yml

parameters:
  reclass:
    _param:
       opencontrail_gateway_hostname: gtw01
    storage:
      node:
        opencontrail_gateway_node01:
          name: ${_param:opencontrail_gateway_hostname}
          domain: ${_param:cluster_domain}
          classes:
          - cluster.${_param:cluster_name}.opencontrail.gateway
          params:
            salt_master_host: ${_param:reclass_config_master}
            linux_system_codename: trusty
            single_address: ${_param:opencontrail_gateway_address}