Allow setting region without updating provider
Allow setting region without updating provider

Same problem as https://github.com/terraform-google-modules/terraform-google-vm/pull/42 but for the ILB module:

Currently if we work in a specific region we'll have to specify it in our google provider.
This change allows to keep a region-agnostic provider and simply pass the region to the data.google_compute_zones.available resource.
terraform-google-modules/terraform-google-lb-internal