Description of problem:
When running the Create User page in the firstboot wizard twice, one cannot use the credentials given on the first attempt. Appearantly, the user has already been setup, and the wizard does not allow the user to reuse that account.

Version-Release number of selected component (if applicable):
firstboot setup from Fedora 17 TC3 iso image

How reproducible:
Always


Steps to Reproduce:
1. Install a new Fedora 17 (previous versions too maybe)
2. In firstboot, setup a username called “tester” with arbitary password and hit forward.
3. Hit back on the next screen (Date & Time setup)
4. Input the same user information as before and hit Forward
  
Actual results:
Error message: “The username 'tester' is a reserved system account. Please specify another user name.”
After specifying a different user account setup, both accounts are listed in the login manager.


Expected results:
Reuse the account previously created, no second account needed.


Additional info:
Suggestion: Would it be possible to check for the shell set up for the user or anything to see whether an existing user is “legit” or a “system user”?