Placeholder for PR #1516

The '--koji' mode of mergerepo_c implies --all, and thats what we want for bare mode as well. The default merge mode is 'repo' which uses the first found package by name if multiple packages with the same name are in the multiple repos. This causes chaos with rhel8 repos as GA and updates content are in the same repo and if it hits an old version of one package and an update of another that depends on the new version it blows up.

As it is related to new feature in 1.18, let's pull it in also.