1 - revert: systemd: trigger - run after udev.service (for now)
2 after systemd has a new release we can depend on
4 - delete mobile-action-modeswitch
5 (moved to usb_modeswitch)
7 - /run/udev/control socket
8 (add ConditionVirtualization=!pidns)
11 - no longer rename netif in kernel namespace
12 - do not create rules on-the-fly, require explicit
14 - drop persistent optical names
18 - remove deprecated trigger --type=failed logic
20 - remove deprecated BUS=, SYSFS{}=, ID= keys