Terraform GCE output: setting google provider to at least 3.0.0

[mccare]

From #8103: added google provider verison to 3.0.0. For terraform 0.11 it needs to go into the provider block (see https://www.terraform.io/docs/configuration-0-11/providers.html)
Alternative to #8106.

@justinsb : sorry for the duplicate effort. I think the change of the required_provider version needs to go onto the bucket list for moving to terraform 0.12

[k8s-ci-robot]

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[rifelpet]

/ok-to-test

[rifelpet]

/approve
/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: mccare, rifelpet

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[mccare]

/test pull-kops-verify-generated

[rifelpet]

/test pull-kops-e2e-kubernetes-aws