s3-spoolss: Support for adding printer drivers with info level 8

s3-spoolss: Support for adding printer drivers with info level 8

We already supported getting driver info level 8 but not adding it. This
allows adding printer drivers with level. So several fields where emtpy.

Microsoft released a security update for Windows print spooler
components which requires support for driver info level 8 now. This is
needed to find out if a driver is PACKAGE_AWARE or not.

Pair-Programmed-With: Guenther Deschner <gd@samba.org>
Signed-off-by: Andreas Schneider <asn@samba.org>
Signed-off-by: Guenther Deschner <gd@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>