ca780f4a18
This fixes a serious bug on NixOS with swraid where mdadm arrays weren't properly stopped on shutdown. Rather than fixing the unit by adding `Before=final.target` we completely move to upstream units, which uses systemd shutdown hooks instead. This also drives down maintenance costs for us.
*** NixOS *** NixOS is a Linux distribution based on the purely functional package management system Nix. More information can be found at http://nixos.org/nixos and in the manual in doc/manual.