1 - test (now fixed) /dev/tape/ links
3 - /run/udev/control socket
4 (add ConditionVirtualization=!pidns)
6 - move udevd -> --libexecdir
10 - kill rules_generator
12 - move udevadm -> --bindir
16 - warn about RUN+="socket:"
20 - return object with *_unref()
21 - udev_monitor_from_socket()
22 - udev_queue_get_failed_list_entry()