Configure Server 3 of 3 - screen needs clean up

need to add a field to enter "username" above password field.

need to add "verify password" field below Password. It should be validated that they the 2 passwords are equal.

Change the text of the dialog box to:

Please create an administrator account this Server. If you want to join other servers to this one to form a cluster, you will need to use these administrator credentials in the "join cluster" process.