Controller will not replace expired token

[bboreham]

From here:

wksctl/pkg/apis/wksprovider/controller/wksctl/machine_controller.go

Lines 303 to 304 in ae0429a

	if bootstrapTokenHasExpired(secret) {
	newSecret, err := a.installNewBootstrapToken(ns)

to here:

wksctl/pkg/apis/wksprovider/controller/wksctl/machine_controller.go

Lines 342 to 344 in ae0429a

	s, err := a.clientSet.CoreV1().Secrets(ns).Create(context.TODO(), secret, metav1.CreateOptions{})
	if err != nil {
	return nil, gerrors.Errorf("failed to install new bootstrap token %s/%s", ns, secret.ObjectMeta.Name)

installNewBootstrapToken() will return an error if the Secret object already exists, so will not change it.