This has several advantages:
- Tests other than run-command/check-response can be added easily
- Tracebacks are meaningful (which means we'll be able to remove a lot of
test name/description/location tracking code)
- Individual tests can be selected/deselected using normal pytest mechanisms
(but for isolated tests, more changes will be needed)
Reviewed-By: Tomas Babej <tbabej@redhat.com>