Add data source for: google_compute_region_instance_group

[danisla]

Terraform Version

Terraform v0.10.8
Google Provider v1.2.0

The google_compute_instance_group works with zonal managed instance groups like the google_compute_instance_group_manager resource. But we also need a data source that works with the regional instance groups like those created by the google_compute_region_instance_group_manager resource.

API is here: https://cloud.google.com/compute/docs/reference/latest/regionInstanceGroups/listInstances

[ghost]

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