Fix resource generation target

[tomhjp]

make update-resources has been failing for a while now, so we haven't added new APIs in that time.

It seems like Google's discovery/v1 client assumes docs links are in a place where they're not, which caused lots of 404s previously. It's pretty trivial to implement the functionality we need with a plain HTTP client anyway, so I replaced the calls to the API with plain HTTP calls and it's pretty close to working now. The remaining errors are:

errors while generating config: 
unable to add 'bigquery' (version 'v2'): unexpected method formats, get parameters: resource, set parameters: 
unable to add 'dns' (version 'v1beta2'): unable to get schema for setIamPolicy request, could not find policy in schema 'GoogleIamV1SetIamPolicyRequest'
unable to add 'dns' (version 'v1'): unable to get schema for setIamPolicy request, could not find policy in schema 'GoogleIamV1SetIamPolicyRequest'
unable to add 'poly' (version 'v1'), could not find doc - unexpected status code 502
unable to add 'realtimebidding' (version 'v1alpha'), could not find doc - unexpected status code 404

I've also committed the new resources that didn't error (by commenting out the early return for now).

[yzdann]

We are really looking forward to see this out!

[vinay-gopalan]

Closing in favor of #216