I feel like I'm drowning in a pile of experimental-but-almost-stable features... Anyways, since we made the feature opt-in in rpm-ostree in https://github.com/projectatomic/rpm-ostree/pull/1352 let's mirror that a bit here with an environment variable so people can play with it more easily. The tests needed some tweaks; specifically we need to reload the status fact after making changes. I'm still a bit uncertain about the Ansible-as-tests. But we add an upgrade test that uses the new environment variable. Closes: #1583 Approved by: jlebon