* Write wtmp entry on startup (see simpleinit)
* Allow running services as a different UID
* Must be able to specify kill timeout (after which kill -9!)
-* Must rate-limit restart of services. Trying to start at a greater rate
- should trigger failed-to-start notification.
* "triggered" service type: external process notifies Dinit when the service
has started.
* Ability to reload stopped services (reload service description)