Description of Problem:

After installing RedHat Limbo Beta (July, 26th), the "firstboot" system service
is launched to allow configuration of the system before logging in. During this
"firstboot", the user is allowed to register the system against RedHat Network.
The "Red Hat Update Agent" is launched and, on the "Step 2: Register or Update a
User Account" page, the application asks for the "User name". The "User name"
field should only contain alphanumeric characters, not blanks, or other special.
However, if the user enters a "User name" text containing, for example, blanks
or other special characters, the "Red Hat Update Agent" does not complain.
Instead, it allows the user to go on and, at the very end of the registration
process, an error messages states this.


Version-Release number of selected component (if applicable):


How Reproducible:


Steps to Reproduce:
1. Install RedHat Limbo Beta. I choose to install Everything.
2. Once the system is installed, it will reboot and invoke "firstboot"
3. Choose "Yes, register this system with Red Hat Network"
4. On the "Red Hat Update Agent", at "Step 2: Register or Update a User Account"
page, enter a "User name" containing blanks, like for example "Felipe Alfaro
Solana".
5. At the very end of the registration process, you'll receive an error message
complaining that the user name is not valid.

Actual Results:
If the "User name" field contains blanks or other special characters, the user
will need to traverse all pages from the "RedHat Update Agent", instead of being
notified of the mistake at the "Step 2: Register or Update a User Account".

Expected Results:
At the "Step 2: Register or Update a User Account", if the user enters an
incorrect "User name" (i.e. it contains blanks), the agent should immediately
notify the user of this and allow her/him to correct the mistake at this point,
not at the very end of the registration process.

Additional Information: