Related: rhbz#1653934
note: for now use Fedora 28 for the Docker container until
CentOS 8 is released or we figure out how to use subscriptions
for official RHEL 8 images.
these are built on top of beakerlib and we use its internal
protocol to figure out the result without relying on the full
test runner that is tipically used inside of a RHEL environment!
Includes a disabled test snippet for Issue #460
