1. Add _service file to run download_files server side.
2. Add a 'no download' mode to setup. This creates the
_multibuild file.
3. Exclusively build for x86_64
4. Create a specfile.in
5. In _setup process specfile.in to add list of sources.
Signed-off-by: Egbert Eich <eich@suse.com>
