Grant access for all users before login

[Garber, Neal]

> When a user gets his login prompt, no access 
> to the network is allowed because they first 
> get access when they login and freeradius can
> perform an ldap check with the username.
> But when a new user wants to login or the user uses an different computer,
> the user dosen't exist on this machine -> so they can't login -> no
> network connection ->can't load profile -> no local user.

Use machine authentication (if wireless, use "automatic connect").