feat: update terraform SDK to 0.12.0

[QuentinBrosse]

This PR updates the terraform SDK to make this provider compatible with the new terraform v0.12.0. This upgrade doesn't introduce breaking changes.

Fix https://github.com/terraform-providers/terraform-provider-scaleway/issues/124

Upgrading to Terraform v0.12

For most users, upgrading configuration should be completely automatic. Some simple configurations will require no changes at all, and most other configurations can be prepared by running the automatic upgrade tool. Please read on for more information and recommendations on the upgrade process.

Please, check out the complete terraform guide here.

Steps to check this PR

1. Download terraform 0.12.0

$> terraform --version

Terraform v0.12.0

2. Set terraform version in the config file:

terraform {
  required_version = "~> 0.12"
}

3. Build provider:

make build

4. Init terraform with a custom plugin-dir:

./terraform init -plugin-dir=$HOME/go/bin

# Output

Initializing the backend...

Initializing provider plugins...

Terraform has been successfully initialized!
[...]

5. Run tests

make test

6. Run acceptance tests WARN: This operation cost money

make testacc

[kindermoumoute]

LGTM

[nicolai86]

thanks for this, @QuentinBrosse !

[QuentinBrosse]

The v0.12.0 just came out (11h hours ago when I write this comment). I propose to update this PR, is it ok for you @nicolai86?

[nicolai86]

Of course!

[QuentinBrosse]

I suggest you this command to see the diff without all the vendors:

git diff master -- . ':!vendor'

[nicolai86]

Thanks for the hard work in this! I’ll take another look today!

[nicolai86]

LGTM!