This update for python-kiwi fixes the following issues:

- Fixed _get_grub2_mkconfig_tool

Last patch on this method breaks the search for alternative
mkconfig names. It returns always on the first lookup which
could be none. This breaks on systems that uses a different
name than grub2-mkconfig, like on Ubuntu.

- Increase spare space on disk repart (bsc#1165823)

The sizing of the virtual cylinders in parted seems to be unfavorable,
as with some disks and SD cards here the device size is not a multiple
of the cylinder size, so the last incomplete cylinder is wasted.
If this wasted space is more than 5MiB, kiwi tries to resize indefinitely.
Therefore min_additional_mbytes gets increased to prevent running
into this situation.

This update was imported from the SUSE:SLE-15-SP1:Update update project.