Using systemd or sysinit, daemon should react gracefully if it is restarted via UI

For example, if Nuxeo is started using the systemd script from https://doc.nuxeo.com/nxdoc/configuring-the-nuxeo-platform-as-a-daemon-with-systemd/ and an admin uses the UI to install a Marketplace package, the restart does not complete (Nuxeo Launcher doesn't know anything about the service that launched it)

Similarly Nuxeo should play nicely with the init scripts used in Ubuntu/Debian