The BLS config filenames are guaranteed to be unique, so they can be
used as GRUB2 entry id and can also be used to sort the menu entries.
Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
For EFI systems, the BLS fragments were stored in the EFI System Partition
(ESP) while in non-EFI systems it was stored in /boot.
For consistency, it's better to always store the BLS fragments in the same
path regardless of the firmware interface used.
Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>