* figure out a nice way how we can let the admin know what child/sibling unit causes cgroup membership for a specific unit
-* add a kernel command line option to enable the debug shell
-
* journalctl: add the ability to look for the most recent process of a binary. journalctl /usr/bin/X11 --pid=-1 or so...
* set NOTIFY_SOCKET also for control processes
* allow port=0 in .socket units
-* support systemd.mask= on the kernel command line.
-
* recreate systemd's D-Bus private socket file on SIGUSR2
* Support --test based on current system state