Ticket 49284 - resolve crash in memberof when deleting attrs
    
    Bug Description:  We were not reseting the entryScope and
    excludedScopes to NULL/count = 0 when we deleted the attributes.
    This would cause a heap use after free, which mean invalid data
    may have been avaliable to the server causing a later segfault.
    
    Fix Description:  When we do not have an entry scope, guarantee
    we reset it to NULL/0.
    
    https://pagure.io/389-ds-base/issue/49284
    
    Author: wibrown
    
    Review by: mreynolds (Thanks!)