[CentOS] 40_custom be the default option

Mon Nov 18 14:32:53 UTC 2019
Jerry Geis <jerry.geis at gmail.com>

Hi All - I have my 40_custom file setup. What is a good way to make that
the default boot option ?
I'd rather not count menu option lines and change GRUB_DEFAULT to that - as
I am doing this remote.

Thanks

Jerry