Hacky fix of subresource for networking (#4430)

This fixes the SubResource from DnsResolver to match
the SubResource from core networking so that we don't have a million
different <Resource>SubResource's created.

The issue is that dnsresolver and networking are two different Swagger
specifications from two different Swagger folders that both put
resources into the networking group. The 2022-07-01 API just happened to
be supported by both networking and dnsresolver, but many subsequent API
versions of plain networking don't correspond to a dnsresolver version.
This results in inconsistencies between type names in the two versions
of core networking which causes issues adding a new networking version
due to conversion problems.

Author: matthchr