Systemd compatibility according to Mathieu Bridon <bochecha@fedoraproject.org>
    Split out the host keygen into their own command, to ease future migration
    to systemd. Compatitbility with the init script was kept.
    Migrate the package to full native systemd unit files, according to the Fedora
    packaging guidelines.
    Prepate the unit files for running an ondemand server. (do not add it actually)