loader*: Extract and change defaut configuration paths
loader_git and loader_git_disk impacted.
Note: The interesting part here is that we could deploy this. As we
did not touch anything else, and puppet won't clean up the dangling
files by itself (the future old
git-updater.yml and git-loader.yml
are the ones), everything should still run smoothly.
Depends on D834
Migrated from D835 (view on Phabricator)