ceph csi: use namespace prefix in the storageclass test yaml

Signed-off-by: John Mulligan <jmulligan@redhat.com>

cluster/examples/kubernetes/ceph/csi/rbd/storageclass-test.yaml

@@ -12,7 +12,7 @@ apiVersion: storage.k8s.io/v1
 kind: StorageClass
 metadata:
    name: rook-ceph-block
-provisioner: rbd.csi.ceph.com
+provisioner: rook-ceph.rbd.csi.ceph.com
 parameters:
     # clusterID is the namespace where the rook cluster is running
     # If you change this namespace, also change the namespace below where the secret namespaces are defined