Configures the dns-updater record filter (dns-updater#3) so k8s/LB/internal addresses stay out of the authoritative zones.
## Why
Hosts publish records the authoritative server should not hold — `*-flannel.1 A 10.42.x`, `*-kube-lb0 A 198.18.200.x`, and the matching reverse PTRs (`200.18.198`, `2.42.10`) — which the daemon WARNs `NOTAUTH`/`bad authentication` on.
## Changes
- `DNS_UPDATER_DENY_RANGES=198.18.199.0/24,198.18.200.0/24,10.42.0.0/16,10.43.0.0/16` (pod CIDR, service CIDR, LB VIP pool, .199).
- New class params: `deny_ranges` / `allow_ranges` / `deny_domains` / `allow_domains`.
- `package_ensure` → `latest` so hosts pick up the filter release (rpm-internal `metadata_expire` is 1h, so no thrash).
## Sequencing
Needs dns-updater **#3** merged + a new tag (v0.2.0) so the filter env vars are honored. The env keys are ignored by v0.1.0, so this is safe to merge first — it takes effect when hosts upgrade to v0.2.0.
Reviewed-on: #485
Co-authored-by: Ben Vincent <ben@unkin.net>
Co-committed-by: Ben Vincent <ben@unkin.net>
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