* It is not a layered product (otherwise base_product would need to be
configured).
* Add Cloud variant. Its repos are used in image_build section.
* Add source repositories. They are needed for depsolving.
* Remove release_id_allow_missing, which should be product_id_ and only
makes sense if product_id is configured.
* Remove notification_script, as this is handled by CLI option
* Remove link_files: it's called link_type and hardlink-or-copy is
default.
* Set bootable to False, we don't need buildinstall here.
* Use repos and install trees from regular F24 compose for building
images
* Skip some phases to make it faster: we don't need to gather any
packages, so we can skip pkgset, gather and extra_files phases.
Signed-off-by: Lubomír Sedlář <lsedlar@redhat.com>
