Download srpms if they're not in the config data

Previously, srpms were downloaded if 'buildrequires' was not part of the
config data. By loading a bconds cache it started to happen that
'buildrequires' were loaded from the previous build, invalidating the
condition. Nothing was then downloaded (the newer build) and no new
potential buildrequires were extracted.

Author: befeleme

bconds.py

@@ -462,7 +462,7 @@ def parse_args():
             if args.packages and pkg not in args.packages:
                 continue
             for bcond_config in bcond_configs:
-                if 'buildrequires' not in bcond_config:
+                if 'srpm' not in bcond_config:
                     something_was_downloaded |= download_srpm_if_possible(bcond_config)
                     if extract_buildrequires_if_possible(bcond_config):
                         extracted_count += 1