func NewCluster(t testing.TB, size int) *cluster {
	return newCluster(t, &ClusterConfig{Size: size})
}
func NewCluster(t testing.TB, size int) *cluster {
	return newCluster(t, &ClusterConfig{Size: size})
}
// NewCluster returns an unlaunched cluster of the given size which has been
// set to use static bootstrap.