Suggested-by: Anton Midyukov <antohami@altlinux.org>

The un-def kernel should be added to the image
at Evgeny Sinelnikov's <sin@altlinux.org> request.
Together with the un-def kernel, its modules, documentation,
and the installer-feature-cleanup-kernel-stage3 package
were added to keep only one kernel selected by the user
during installation in the installed system.

Suggested-by: Anton Midyukov <antohami@altlinux.org>

During installation, you can configure the system
as a VirtualBox host or as a guest for use with VirtualBox.

Made at the request of Evgeny Sinelnikov <sin@altlinux.org>