controller/node: skip update vlanconfig with witness node

    - we did not apply any vlanconfig on the witness node,
      so we need to skip the vlanconfig update when witness
      node change.

Signed-off-by: Vicente Cheng <vicente.cheng@suse.com>

pkg/controller/manager/node/controller.go

@@ -61,6 +61,11 @@ func (h Handler) OnChange(_ string, node *corev1.Node) (*corev1.Node, error) {
 		return nil, err
 	}
 
+	// skip witness node because we do not allow vlan config on witness node
+	if node.Labels != nil && node.Labels[utils.HarvesterWitnessNodeLabelKey] == "true" {
+		return nil, nil
+	}
+
 	vcs, err := h.vcCache.List(labels.Everything())
 	if err != nil {
 		return nil, err