*
* spawn user systemd
* direct client API
- * add display symlinks also per-session
*
* udev:
* drop redundant udev_device_get_is_initialized() use as soon as libudev is fixed
* use device_has_tag() as soon as it is available
- * trigger based on libudev if available
* enumerate recursively with libudev when triggering
* use sysfs in device hash table, not sysname, when fb driver is fixed
- * fix ACL enumeration as soon as libudev can properly handle two match tags when enumerating
*
* non-local X11 server
* reboot/shutdown halt management