Remove blanket skips for Python 3 in CI (#10043)
* Remove blanket skips for Python 3 in CI.
* Try to fix hg tests.
* Disable hg tests.
* Drop restriction of supervisor to <4.0.0.
This was introduced in https://github.com/ansible/ansible/pull/54935.
* Make tests work with supervisorctl 4.0.0.
According to https://supervisord.org/changes.html#id12,
"supervisorctl will now set its exit code to a non-zero value when an error condition occurs."
I'm not sure why a stopped service in 'status' constitutes an error condition,
but whatever 🤷...
* Use correct Python executable.
* Skip RHEL/macOS; diff on config write.
* Skip CentOS 7 and OpenSuSE on ansible-core 2.16.
(cherry picked from commit 2a5abab738)
Co-authored-by: Felix Fontein <felix@fontein.de>
