Anatol Pomozov authored Feb 19, 2020 and Allan McRae committed Feb 24, 2020

Currently, download_files() creates payloads for all packages then
iterates over them, calling download_single_file.  This can be
simplified by looping over packages and constructing the payload as needed.

Signed-off-by: Anatol Pomozov <anatol.pomozov@gmail.com>
Signed-off-by: Allan McRae <allan@archlinux.org>