20-grub-install: Replace, rather than overwrite, the existing kernel (pjones)
Resolves: rhbz#1642402
99-grub-mkconfig: Don't update grubenv generating entries on ppc64le
Related: rhbz#1637875
blscfg: fallback to default_kernelopts if BLS option field isn't set
Related: rhbz#1625124
grub-switch-to-blscfg: copy increment.mod for legacy BIOS and ppc64
Resolves: rhbz#1652806
Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
