* CI: Try a full ssh connection on hosts instead of only checking the port
If we only try the port, we can try to connect in the playbook which is
executed next even though the managed node has not yet completed it's
boot-up sequence ("System is booting up. Unprivileged users are not
permitted to log in yet. Please come back later. For technical details,
see pam_nologin(8).")
This does not account for python-less hosts, but we don't use those in
CI anyway (for now, at least).
* CI: Remove connection method override when creating VMs
This prevented wait_for_connection to work correctly by hijacking the
connection to localhost, thus bypassing the connection check.
---------
Co-authored-by: Max Gautier <mg@max.gautier.name>
