6116. [bug] Fix error path cleanup issues in dns_catz_new_zones()
and dns_catz_new_zone() functions. [GL #3900]
+6115. [bug] Unregister db update notify callback before detaching
+ from the previous db inside the catz update notify
+ callback. Also, call the db notify callbacks only after
+ zone_postload() returns successfully. [GL #3777]
+
6114. [func] Run the catalog zone update process on the offload
threads. [GL #3881]