Trac Ticket #443 - Deleting attribute present in
nsslapd-allowed-to-delete-attrs returns Operations error
https://fedorahosted.org/389/ticket/443
Bug Description: Even if setting a config parameter to nsslapd-
allowed-to-delete-attrs, the value failed to delete if the type
was on|off or integer.
Fix Description: Store all the initial config param values in
ConfigList. If the attribute value is deleted, reset the initial
value.
(cherry picked from commit 90dd9bb3c1411daca353d055d90618e67aa1fa7e)