Do not introduce new options into configuration file. But if limits are
hit in unexpected way, allow tuning them by environment variables
DNS_RDATASET_MAX_RECORDS and DNS_RBTDB_MAX_RTYPES. They accept number of
maximum records of types. Both defaults to 100.
These replaces max-records-per-type and max-types-per-name in later
versions. But can be configured only by environment and can be
configured only globally, not in each view or zone.
Related: RHEL-49900
