Finalizes the linked BZ to fix passing down custom authfiles during auto
updates. Also fixes the if-newer pull policy.
[NO TESTS NEEDED] for now validated manually. There's a TODO to add a
new system test that I did not find time for before PTO.
BZ: bugzilla.redhat.com/show_bug.cgi?id=2000943
Signed-off-by: Valentin Rothberg <rothberg@redhat.com>