[1/5] Catalog zones lightweight cleanup
Do some lightweight code cleanup and fixes in preparation of adding some new feature from the latest DNS catalog zones draft.
ISC is looking for an experienced support engineer or systems administrator to provide third-level support for our open source. We have a team of 6 who provide 7 x 24 coverage, all working from home. https://isc.recruitee.com/o/support-engineer-for-isc-bind-and-kea-dhcp-newmarket