Revert "LDAP: Change defaults for ldap_user/group_objectsid"
    
    This reverts commit f834f712548db811695ea0fd6d6b31d3bd03e2a3.
    
    OpenLDAP server cannot dereference unknown attributes. The attribute objectSID
    isn't in any standard objectclass on OpenLDAP server. This is a reason why
    objectSID cannot be set by default in rfc2307 map and rfc2307bis map.
    It is the same problem as using non standard attribute "nsUniqueId"
    in ticket https://fedorahosted.org/sssd/ticket/2383
    
    Reviewed-by: Michal Židek <mzidek@redhat.com>