Ticket 49008 - Adjust CI test for new memberOf behavior
    
    Bug Description:  In the current version the MO plugin now adds a valid
                      objectclass to an entry.  This breaks the test design
                      as some operations were expected to fail, but now they
                      pass.
    
    Fix Description:  Set the auto add objectclass to an objectclass that
                      does not allow memberOf.  This now allows the test
                      work as designed.
    
    https://pagure.io/389-ds-base/issue/49008
    
    Reviewed by: firstyear(Thanks!)