ipatests: Verify that securitydomain is updated on server-del
    
    For every server-del ensure that the server being deleted is
    also removed from the PKI securitydomain.
    
    https://pagure.io/freeipa/issue/8930
    
    Signed-off-by: Rob Crittenden <rcritten@redhat.com>
    Reviewed-By: Florence Blanc-Renaud <frenaud@redhat.com>