* certbot-apache: use httpd for newer RHEL derived distros
A change in RHEL 9 is causing apachectl to error out when used
with additional arguments, resulting in certbot errors. The CentOS
configurator now uses httpd instead for RHEL 9 (and later) derived
distros.
* Single CentOS class which uses the apache_bin option
* soothe mypy
* Always call super()._override_cmds()