[Cooker] Suggestion: switch order of asking for username and root passwordduring install

[Bruce A. Mallett]

About a week ago there were some good suggestions about dealing with the
single-user autologin feature, wrt. changes to the menu so as to discourage
enabling this feature. Along the same lines I'd suggest switching the order
in which the installation prompts for setting up users and setting the root
password.

If the user setup is done first then new users are more likely to add themselves
as a user. Then when prompted for the root/admin. password they will have
already setup a non-root user that can be the default login.


- Bruce