* Dangling symlinks of .automount unit files in .wants/ directories, set up
automount points even when the original .automount file did not exist
anymore. Only the .mount unit was still around.
* properly handle .mount unit state tracking when two mount points are stacked one on top of another on the exact same mount point.
* shorten the message to sane length:
Cannot add dependency job for unit display-manager.service, ignoring: Unit display-manager.service failed to load: No such file or directory. See system logs and 'systemctl status display-manager.service' for details.
* sd_bus_unref() is broken regarding self-references and "pseudo thread-safety".
See the comment in sd_bus_unref() for more..
External:
* Fedora: when installing fedora with yum --installroot /var/run is a directory, not a symlink
