Extend test for orphan automember rules (issue/6476)
    
    The test was not executing ipa automember-rebuild --type hostgroup.
    
    The test has been extended to execute it twice: Once when it needs to fail
    because there is an orphan automember rule. Also after this orphan
    automember rule has been removed. Here the test needs to succeed.
    
    Fixes: https://pagure.io/freeipa/issue/7891
    Signed-off-by: Thomas Woerner <twoerner@redhat.com>
    Reviewed-By: Christian Heimes <cheimes@redhat.com>