gdm early login

[Ray Strode]

Hi, 
> you saved a few seconds of my day.
> a user should wait  nearly 1 minute for the ready desktop?
> and this is a step forward?
There is still some room improvement.  Even with early-boot,
we currently start all services before we process user login requests.

In fact, there are probably only a few services that need to be started
before login in order for the user to have a usable desktop session.

If we can finger what these services are then we'll be able to change
the priority of the gdm-allow-login script to run before the unessential
services and hopefully get a significant boot time speedup.

--Ray