ldap_modify on OPENLDAP_REL_ENG_1_2

[Randy Kunkee <kunkee@pluto.ops.NeoSoft.com>]

In its current state, OPENLDAP_REL_ENG_1_2 appears to loose the indexes
when you replace an indexed attribute.  In the specific case I used, the cn
was my initials ("rrk"), and I replaced it with two cns "rrk" and "randy".
after that, a search on cn for "rrk" failed.

I'll look into this more in a few hours, but if anybody else is already
ahead of me on this, please speak up!

Thanks,
Randy