Terraform validator: skip google_compute_instance boot disk verification for unconfigured provider

[melinath]

Terraform validator supports an "offline" mode which purposely does not configure the provider for GCP access. However, the expandBootDisk function for compute_instance assumes that the provider is configured for GCP access. We should silently skip this verification (at least when offline), because terraform validator is not responsible for validating that the configuration is correct, just that it complies with policies.

This is somewhat complicated by the fact that expandBootDisk is currently manually "shared" between terraform-provider-google and terraform-google-conversion (i.e. copy-pasted from one to the other.)

[melinath]

Possibly related: GoogleCloudPlatform/terraform-validator#89

[melinath]

Closing as a duplicate of the above issue.

[github-actions]

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