WPS: Added support for wildcard PINs that work with any UUID-E

WPS: Added support for wildcard PINs that work with any UUID-E

Since the Registrar may not yet know the UUID-E when a new PIN is
entered, use of a wildcard PIN that works with any UUID-E can be useful.
Such a PIN will be bound to the first Enrollee trying to use it and it
will be invalidated after the first use.