"Upgrading from 2.3.x" section in Changes Appendix for Admin Guide

Hi All,

I think it's worth adding an upgrading section, as I'm just playing with a copy of a live 2.3.38 system and an upgrade to LDAP_REL_ENG_2_4 is giving:

olcReplicationInterval: value #0: <olcReplicationInterval> keyword is obsolete (ignored) str2entry: invalid value for attributeType objectClass #0 (syntax 1.3.6.1.4.1.1466.115.121.1.38) => ldif_enum_tree: failed to read entry for /usr/local/etc/openldap/slapd.d/cn=config/cn=include{0}.ldif slaptest: bad configuration file!

Admittedly, no slapcat was done as the bdb env is the same, but thought I'd do what a normal user would ;-)

Should we list obsolete values from bconfig.c that will apply and discuss/present the best way to upgrade?

Thoughts?