If provided, round the disk image size up to a multiple of the value.
This allows for image formats with specific size-alignment requirements
(e.g., disk size must be in GiB).
(cherry picked from commit 8ef4f431d8)
Related: rhbz#1689140
reqpart can be used to make kickstarts more platform agnostic, creating
needed partitions without lmc having to keep track of the arch-specific
needs. eg. ppc64 needs prepboot and /boot
This increases the size of the disk based on whether reqpart or
reqpart --add-boot is in the kickstart.
Note that this is only valid for partitioned disk output types, not
for filesystem images or live iso output.
Related: rhbz#1673744
Add a /.in-container file to the container root so that tests requiring root
and loop device support will be skipped when running in a container.
Related: rhbz#1673744
