code: func NewCmdConfigImages(out io.Writer) *cobra.Command {
  	cmd := &cobra.Command{
  		Use:   "images",
  		Short: "Interact with container images used by kubeadm",
  		RunE:  cmdutil.SubCmdRunE("images"),
  	}
  	cmd.AddCommand(NewCmdConfigImagesList(out, nil))
  	cmd.AddCommand(NewCmdConfigImagesPull())
  	return cmd
  }
docs: // NewCmdConfigImages returns the "kubeadm config images" command