AXFR: message too large

[fritterhoff]

Hello (again),

we are using dnscontrol for a large bunch of zones. The most zones are updated using AXFR. In case of large updates (e.g. changing the ttl for the complete zone) results pretty often in the error "message too large". From my point of view it maybe would make sense to catch this error and retry the operation in small batches?

Before implementing this change I wanted to discuss if there is maybe any corner case I did not consider?

Thanks!

[tlimoncelli]

CC @hnrgrgr (maintainer of axfrddns)