Investigate systemd --user support

[bigon]

For each user a systemd --user process is spawned.

A configurable type ($user_systemd_t?) should probably be created.

[ghost]

Probably. Except for unconfined_u users. Their systemd --user instance should run with unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023, I would argue. Fedora seems to also go that route slowly but surely. I saw in a systemd.conf video that RHEL7 does not have systemd --user. They seem to argue that systemd --user is not stable. They have a point, but knowing systemd they usually do not implement something if they aren't sure about it. So my money say's that systemd --user is here to stay.