User Tracker: Test to create user with minimal values
    
    Test to create user with minimal values, where uid is not specified
    
    https://fedorahosted.org/freeipa/ticket/6126
    
    Reviewed-By: Stanislav Laznicka <slaznick@redhat.com>
    Reviewed-By: Milan Kubik <mkubik@redhat.com>
    Reviewed-By: Lenka Doudova <ldoudova@redhat.com>