In Fedora/RISC-V case kernel and bootloader (BBL - Berkeley Boot Loader)
are external to the image. The image only delivers rootfs. Thus our
kickstart has bootloader --location=none --disabled.

If user disabled bootloader:
- Allow user to pick partition layout (i.e. do not ignore it).
- Do not write GRUB Legacy config (/boot/grub/grub.conf)

The changes were successfully used for Fedora RISC-V (riscv64) disk
images.

Tested on Fedora 29/x86_64 with Python 3. I used kickstart file
and appliance-creator execution line from Fedora-Minimal-armhfp-Rawhide-20181114.n.0
compose. Slight changes were made (armhfp to x86_64, removed
some packages), but main one was:

#bootloader --location=mbr
bootloader --location=none --disabled
zerombr
clearpart --all --initlabel --disklabel=gpt

I used guestfish to verify that /boot/grub/grub.conf is gone and
gdisk for GPT partition layout check on disk image.

Obsoletes: https://pagure.io/appliance-tools/pull-request/4

Signed-off-by: David Abdurachmanov david.abdurachmanov@gmail.com