132/133 should use resource_reference_child_type

[rambleraptor]

Fixes #112

This does two things:

• Makes sure that we use resource_reference_child_type
• Changes GetResourceReference to return a struct instead of creating a google.api.resource_reference. We shouldn't have a dependency on that proto message anymore.

[rambleraptor]

@ethanoroshiba @andrew-womeldorf please take a look! This should address your issues.

[ethanoroshiba]

Allowing resource_reference to point to the child type in List* methods breaks this lint I think, since this mandates that the resource_reference annotation on the parent field refer to the parent of the listed type, as opposed to the listed type itself. This logic looks like it existed previously, though, so maybe you'd ticket it separately. Aside from that, LGTM.

[andrew-womeldorf]

This fixed my issue, once I added the new resource_reference_child_type annotations. Thanks!

[rambleraptor]

@ethanoroshiba do you mind filing a ticket for that?

[ethanoroshiba]

@rambleraptor issue open for that here: #116

[toumorokoshi]

Approving to unblock those broken by the previous change, but following up on #116 makes a lot of sense.