Remove the kDNSServiceInterfaceIndexLocalOnly special-case on Darwin. #26287
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Interface kDNSServiceInterfaceIndexLocalOnly means the registration is local-only, not that the registered host is localhost and has a loopback address. There can be local-only registrations for other hosts, and we need to do actual address resolution.
To make this work right in our unit test setup, fix our registration code for the local-only case (which tests use) to register hostname -> IP mappings, which it was not doing before.