If you have a catalog zone containing 10.in-addr.arpa and an
explicitly-configured version which overrides the catz version,
named used to log a warning:
catz: error "success" while trying to add zone "10.in-addr.arpa"
After this patch it logs an informational message:
catz: zone "10.in-addr.arpa" is overridden by explicitly configured zone
In Cambridge our catz includes a version of 10.in-addr.arpa suitable for most cases, but we want departments to be able to override it if they are using addresses in 10/9 (sic - they can only use the bottom half! More info at https://www.dns.cam.ac.uk/domains/reverse/ten.html)