Log Message:
Upgrade the openldap packages to 2.3.24, the new "stable" release.

Changes since 2.3.23:
* Fixed slapd syncrepl timestamp bug (delta-sync/cascade) (ITS#4567)
* Fixed slapd-bdb/hdb non-root users adding suffix/root entries (ITS#4552)
* Re-fixed slapd-ldap improper free bug in exop (ITS#4550)
* Fixed slapd-ldif assert bug (ITS#4568)
* Fixed slapo-syncprov crash under glued database (ITS#4562)

Note that since the clients and libraries didn't change, openldap-server still
depends on openldap-client>=2.3.23 (to ease updates of client applications).