Create multiple firewall rules in existing firewall section bounded by
limit of 1000 firewall rules per section. Adding multiple firewall rules in
a section modifies parent section entity and simultaneous update (modify)
operations on same section are not allowed to prevent overwriting stale
contents to firewall section. If a concurrent update is performed, HTTP
response code 409 will be returned to the client operating on stale data.
That client should retrieve the firewall section again and re-apply its
update.