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
14 - remove deprecated trigger --type=failed logic
16 - remove deprecated BUS=, SYSFS{}=, ID= keys
20 - warn about RUN+="socket:"
22 - libudev.so.1 with symbol versioning:
23 - return object with *_unref()
24 - udev_monitor_from_socket()