Change:
Extend the logic for custom error handling in the dnf module, so that on
newer DNF (such as DNF that ships with modern Fedora 31 container
images, and ships with RHEL 8.2) we report errors consistently with
older DNF.
Test Plan:
Ran dnf integration tests against an old Fedora 31 container image and a
brand new Fedora 32 container image; tess passed on both.
Signed-off-by: Rick Elrod <rick@elrod.me>
