- adds distro dependency
- buildbot nodaemon in service module
- fakerepo for module tests
- service module parameter fixup
- tested on nixos
- tested on darwin
1) The forking behavior of `buildbot start` is temporarily broken for
mysterious reasons that I'm still looking into
2) Let systemd do the forking: no point in using two different process
startup wait loops
The nixbld group belongs to nix-daemon and you really don't want to be
in it. If you are in it, nix-daemon will kill your processes when you
least expect it :)