code: func makeDockerClientWithTLS(config types.Config, ca, cert, key *os.File, endpoint, apiversion string) (engine.API, error) {
  	return docker.MakeRawClientWithTLS(config, ca, cert, key, endpoint, apiversion)
  }
docs: // use endpoint, cert files path, and api version to create docker client
  // we don't check whether this is connectable