docs: def filter_by_device_owner(query, device_owners=None):
      """Filter ports by device_owner
  
      Either filter using specified device_owner or using the list of all
      device_owners supported and unsupported by the arista ML2 plugin
      """
      port_model = models_v2.Port
      if not device_owners:
          device_owners = utils.SUPPORTED_DEVICE_OWNERS
      supported_device_owner_filter = [
          port_model.device_owner.ilike('%s%%' % owner)
          for owner in device_owners]
      unsupported_device_owner_filter = [
          port_model.device_owner.notilike('%s%%' % owner)
          for owner in utils.UNSUPPORTED_DEVICE_OWNERS]
      query = (query
               .filter(
                   and_(*unsupported_device_owner_filter),
                   or_(*supported_device_owner_filter)))
      return query