ITS#9538 Serialise CSN assignment in slapo-accesslog

Ondřej Kuzníkrequested to merge
ondra/openldap:its9538 into master

Outstanding items (for review):

  • in principle, is using slap_get_csn(,,1) for CSN assignment correct? What about the interaction with the slap_get_commit_csn part of accesslog_response?
  • I'll probably remove the asserts(0) in the read-only paths after more testing?

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