ceph: remove osd pvc when the cluster is gone

Just like we do for the monitors, we set an ownerref to the OSD PVC so
when the cluster is deleted we remove the PVC too.

Signed-off-by: Sébastien Han <seb@redhat.com>

pkg/operator/ceph/cluster/osd/deviceSet.go

@@ -25,6 +25,7 @@ import (
 	rookv1 "github.com/rook/rook/pkg/apis/rook.io/v1"
 	"github.com/rook/rook/pkg/clusterd"
 	"github.com/rook/rook/pkg/operator/ceph/controller"
+	"github.com/rook/rook/pkg/operator/k8sutil"
 	v1 "k8s.io/api/core/v1"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 )
@@ -118,6 +119,7 @@ func (c *Cluster) createStorageClassDeviceSetPVC(existingPVCs map[string]*v1.Per
 		existingPVC = existingPVCs[pvcStorageClassDeviceSetPVCId]
 	}
 	pvc := makeStorageClassDeviceSetPVC(storageClassDeviceSetName, pvcStorageClassDeviceSetPVCId, setIndex, pvcTemplate)
+	k8sutil.SetOwnerRef(&pvc.ObjectMeta, &c.clusterInfo.OwnerRef)
 
 	if existingPVC != nil {
 		logger.Infof("OSD PVC %q already exists", existingPVC.Name)