Note: With or without this PR, I still encounter a fatal python 3 related error when using ansible-playbook-3 to run tests.yml using a docker test subject. That error appears to be a known issue already being addressed by https://github.com/ansible/ansible/pull/24776#issuecomment-322269809.
ansible-playbook-3
tests.yml
Looks good to me. Tested with sed tests (docker and merge inventory) as well as rpm-ostree tests (qcow2). Works well.
Pull-Request has been merged by stefw