Features:
+* logind introduce two types of sessions: "heavy" and "light". The former would
+ be our current sessions. But the latter would be a new type of session that
+ is mostly the same but does not pull in user@.service or wait for it. Then,
+ allow configuration which type of session is desired via pam_systemd
+ parameters, and then make user@.service's session one of these "light" ones.
+ People could then choose to make FTP sessions and suchlike "light" if they
+ don't want the service manager to be started for that.
+
* /etc/veritytab: allow that the roothash column can be specified as fs path
including a path to an AF_UNIX path, similar to how we do things with the
keys of /etc/crypttab. That way people can store/provide the roothash