Pass default domain ID keystoneservice project

With [1] the domain ID can be passed to project and user resurces.
With [2] the default domain ID gets already passed for creating the
user, lets also set it on the project.

[1] openstack-k8s-operators/lib-common#314
[2] d73d07c

controllers/keystoneservice_controller.go

@@ -457,6 +457,7 @@ func (r *KeystoneServiceReconciler) reconcileUser(
 		openstack.Project{
 			Name:        "service",
 			Description: "service",
+			DomainID:    "default",
 		})
 	if err != nil {
 		return ctrl.Result{}, err