Add ordering by name to User model in admin.
|Reported by:||Malcolm Tredinnick||Owned by:||nobody|
|Has patch:||no||Needs documentation:||no|
|Needs tests:||no||Patch needs improvement:||no|
This is the newforms-admin version of #6089. Since we removed the default ordering from the User class, it needs to be added back to the Admin ordering for that class. I suspect Admin changes are the one thing that are hard to merge into the branch, so I'm making a new ticket for this.