Migration does not add users to default group
    
    When users with missing default group were searched, IPA suffix was
    not passed so these users were searched in a wrong base DN. Thus,
    no user was detected and added to default group.
    
    https://fedorahosted.org/freeipa/ticket/4141
    
    Reviewed-By: Petr Viktorin <pviktori@redhat.com>