e60080efa2
The dynamic mode produced a byte-identical cluster to authoritative:
RFC2136 update capability is a per-zone property (BindZone.dynamicUpdate
+ updateKeyRef render allow-update { key ... }), not a cluster role. The
external-dns tier is just an authoritative cluster whose zones allow
dynamic updates.
- remove BindMode dynamic from the enum and constants
- switch the external-dns sample to mode authoritative
- update README migration mapping