SYSTEMD: Give us a option for upstart

[Kevin Kofler]

Lucas wrote:
> REMOVED /sbin/start_udev - this means that upstart wont be able to start
> udev without manual tweak. Upstart reads rc.sysinit and there is still 
> "/sbin/start_udev". And also this means that any one who will try to use
> upstart in Fedora 16 (now rawhide) wont get udev works.
> 
> What do you think I thought about all of this?

That's exactly why I think it's a mistake to try to continue supporting 
upstart.

        Kevin Kofler