Add min_cpu_platform to google_compute_instance resource

[hashibot]

This issue was originally opened by @nodesocket as hashicorp/terraform#15038. It was migrated here as part of the provider split. The original body of the issue is below.

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Google Compute Engine just released (blog post, technical doc) a new feature which allows you specify the cpu platform when creating VM instances. This allow you to provision the newest Skylake cpus.

Therefore I suggest adding a new string option to the google_compute_instance resource called cpu_platform.

[ubschmidt2]

Blocked by #93.

[rileykarson]

Linking #311

[ghost]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.

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