Yield partial results so large Rucio lookups start faster

Author: ponyisi

did_finder_rucio/src/rucio_did_finder/lookup_request.py

@@ -69,7 +69,7 @@ def lookup_files(self):
                 ds_size += af['file_size']
                 total_paths += len(af['paths'])
                 full_file_list.append(af)
-        yield full_file_list
+            yield ds_files
 
         lookup_finish = datetime.now()