It seems like 240 retries is just not long enough for all the
non-destructive tests running in parallel to finish. Let's crank that up
to 500 retries.
Closes: #1548
Approved by: cgwalters
Let's be opinionated now, and our installed/ test story *is*
Ansible/STR. Merge `tests/fedora-str` into `tests/installed/`.
Rework the nondestructive tests into a separate playbook run, and parallelize
them for more efficiency.
The destructive tests are also changed to use Ansible more.
Add a higher level `run.sh` entrypoint and update the `README.md`
with some useful tips.
Closes: #1513
Approved by: jlebon