provider/google: Fix instance group manager instance restart policy

[lwander]

As pointed out in #3875, instance_group_manager does not restart instances on an instance_template change. Since some people might not want this behavior, I added a update_strategy field to allow instance_template changes to avoid restarting instances (see the options here). @jen20 @sparkprime @premist

[premist]

I checked out this PR(lwander/terraform@7be9021) locally and I got the following error. Is there something I need to configure additionally?

~/Development/infrastructure master*
❯ terraform -v
Terraform v0.6.7-dev (7be90215bcf00b05d7b7d14ebcee60cc39bfeeee+CHANGES)


~/Development/infrastructure master*
❯ terraform plan
There are warnings and/or errors related to your configuration. Please
fix these before continuing.

Errors:

  * google_compute_instance_group_manager.xxxxx: : invalid or unknown key: update_strategy

[lwander]

Did you run make dev? Can you post your TF file? I can't seem to replicate that.

[lwander]

@premist have you had a chance to try again?

[premist]

Hi @lwander, previously I did run make dev, copied binaries to my PATH and I got the error above.

I tried again just now after resetting my go environment, and it works as intended (attaching terraform plan results below). Sorry for the confusion!

~ google_compute_instance_group_manager.xxx
    update_strategy: "" => "RESTART"

[ghost]

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