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For use with back-ldap/back-meta/syncrepl/etc

Add an option to specify how subjectAlternativeNames should be
handled when validating the names in a server certificate.

Requires OpenSSL 1.0.2 or newer

Ignore if it's defined already. Make it no-user-mod.

Reallocates sockets from old to new listener threads

Prep for main changes

and pass error message back to frontend

Remove bash-isms

Provide a more specific diagnostic when configuring with
--enable-<option>=mod but not --enable-modules. Make this an error for
both backends and overlays, and remove the automatic fallback to static.

and do some LDIF cleanup

For delta-sync as well as regular sync