Add systemd support to debian-edu-restart-services

This is a bit tricky, the radical approach employed by the sysvinit code of stopping everything which is not part of runlevel 1 could only reasonably be emulated by systemctl isolate rescue.target followed by systemctl isolate default.target or employing snapshots. However, that would also kill off a terminal emulator where the command was run from. systemd v254 also provides soft-reboot but as the former solution the difference to a real reboot would be marginal.

This uses a list of service units which was compiled on a main server + ltsp installation. Uses stop and start to force restart reverse-dependencies. It also makes sure that drop in files are recognized. Closes: #1042940

assigned to @sunweaver

added 16 commits

• a5dc5093...e9f9ab68 - 15 commits from branch master
• 7bf138c3 - Add systemd support to debian-edu-restart-services

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