Create a user with sudo priviledges

[markmc]

The common.sh script checks that the current user has password-less sudo access. We should have a script that creates this user.

[rlopez133]

The custom ISO right now handles the creation of the user that has password-less sudo access as part of the %post of the ks.cfg. What we need to figure out is what the name of that user should be and the password of that user. I'm assuming we'd still want it part of the ISO? I mention this because then there is no need for logging in as root.