Bug 616850 - ldapmodify failed to reject the replace operation
    if its targeted for an Unknown attribute
    
    https://bugzilla.redhat.com/show_bug.cgi?id=616850
    
    Description: Attempting to modify an unknown attribute in the
    config entry fails with LDAP_UNWILLING_TO_PERFORM, while starting
    up just ignores unknown attributes and the server successfully
    starts.