fix(dracut-systemd): replace `rd.udev.log-priority` with `rd.udev.log_level`

[aafeijoo-suse]

rd.udev.log-priority is deprecated since systemd-v247 (https://github.com/systemd/systemd/commit/64a3494c)

Also, fix deprecation warning not being displayed for rdudevinfo and rdudevdebug.

Checklist

• [X] I have tested it locally
• [ ] I have reviewed and updated any documentation if relevant
• [ ] I am providing new code and test(s) for it

[stale[bot]]

This issue is being marked as stale because it has not had any recent activity. It will be closed if no further activity occurs. If this is still an issue in the latest release of Dracut and you would like to keep it open please comment on this issue within the next 7 days. Thank you for your contributions.

[stale[bot]]

This issue is being marked as stale because it has not had any recent activity. It will be closed if no further activity occurs. If this is still an issue in the latest release of Dracut and you would like to keep it open please comment on this issue within the next 7 days. Thank you for your contributions.