Declare attribute type 'PdnsDomainId' as Integer with ordering match

[stroeder]

Declare attribute type 'PdnsDomainId' as Integer with ordering match (closes #11247).

Short description

LDAP schema change to declare attribute type 'PdnsDomainId' as Integer to enable commonly used techniques for unique value assignment (see details in issue #11247).

Checklist

I have:

• [X] read the CONTRIBUTING.md document

[rgacogne]

If we do this, we might want to add a clear warning to the upgrade notes and instructions on how to re-import and/or re-index the database?

[stroeder]

Thanks, please add a note to docs/upgrading.rst

Adding such a note would require coordinating the release version. For which release would you accept this change?

[Habbie]

Adding such a note would require coordinating the release version. For which release would you accept this change?

"to master" works without coordination, but let's assume 4.8.0

[Habbie]

This still needs docs. If you're quick, we can target 4.9 :) but otherwise, "to master" is always valid, and then we can fix it when we release.

[Habbie]

ping! (we missed 4.9, but "to master" is still fine for the upgrade notes)