code: func respWithMetadata(i interface{}) (interface{}, *ResponseMetadata, error) {
  	return i, &ResponseMetadata{
  		LastContact: 0,
  		LastIndex:   uint64(time.Now().Unix()),
  	}, nil
  }
docs: // respWithMetadata is a short wrapper to return the given interface with fake
  // response metadata for non-Consul dependencies.