code: func (a *Agent) ListKeys(token string, relayFactor uint8) (*structs.KeyringResponses, error) {
  	args := structs.KeyringRequest{Operation: structs.KeyringList}
  	parseKeyringRequest(&args, token, relayFactor)
  	return a.keyringProcess(&args)
  }
docs: // ListKeys lists out all keys installed on the collective Consul cluster. This
  // includes both servers and clients in all DC's.