need desktop-common-data-6.2+
perl_checker cleanups by Thierry Vignaud

rationale: they never made it into translation catalogs

or more generally, do not switch from current scheme to default one if
not told otherwise

else we get errors when partitionning after clearing them, such as:
"INTERNAL ERROR: unknown device vda7"

same rationale as in commit 767048570e8c44061cb0d6faf689698d3313870c for
mga#18666

this wasn't an issue as we later round partition on 1MB boundary but
it's still cleaner/safer...

rationale: write_*() takes (bootloader, all_hd, ext) as parameters (when
called from installkernel -> bootloader-config and then only when
migrating to uuids

as we don't care for 2 first for grub2, just ignore the 3rd too