Ticket 50077 - Do not automatically turn automember postop modifies on
Description: Although we have set the new postop processing on by
default in the template-dse.ldif, we do not want to
enable it by default for upgrades (only new installs).
So if the attribute is not set, it is assumed "off".
https://pagure.io/389-ds-base/issue/50077
Reviewed by: firstyear(Thanks!)