Tests: Stage User Tracker implementation
Fix provide possibility of creation stage user with minimal values,
with uid not specified and check for non-empty unicode string
for attributes requested in init method
https://fedorahosted.org/freeipa/ticket/6448
Reviewed-By: Lenka Doudova <ldoudova@redhat.com>
Reviewed-By: Stanislav Laznicka <slaznick@redhat.com>