This part here has a typo/error in the yaml file:

Create a file on your workstation named secret_libvirt.yaml to define the libvirt secret:
apiVersion: v1
data:
LibvirtPassword: <base64_password>
namespace: openstack <------------ this shouldn't be here
kind: Secret
metadata:
name: libvirt-secret
namespace: openstack
type: Opaque
Also, if you look at secret_subscription.yaml and secret_libvirt.yaml, "metadata" par is first instead of data in the example above. Can we switch it in the doc for secret_libvirt.yaml?