DNS renumbering procedure fails if git server is unavailable
it's unclear to me how to renumber a server that only has a record in LDAP (as opposed to something in
dns/domains.git as well).
in #33730 (moved), the DNS records were not picked up by nevii, the authoritative nameserver, even after running
ud-generate on alberti and
ud-replicate on nevii. and indeed, those commands only populate
/var/lib/misc/ on nevii, which doesn't touch the full zone loaded by bind.
so this needs clarification and documentation and aaargh.