Promote resolve-subnet-mask field in Subnetwork resource to GA (#16791) (#1257)

[upstream:2090f191de8d0c538e658e9d3d3b4b6fefeb9ee9]

Signed-off-by: Modular Magician <magic-modules@google.com>

Author: modular-magician

subnetwork_resolve_subnet_mask/backing_file.tf

@@ -0,0 +1,15 @@
+# This file has some scaffolding to make sure that names are unique and that
+# a region and zone are selected when you try to create your Terraform resources.
+
+locals {
+  name_suffix = "${random_pet.suffix.id}"
+}
+
+resource "random_pet" "suffix" {
+  length = 2
+}
+
+provider "google" {
+  region = "us-central1"
+  zone   = "us-central1-c"
+}

subnetwork_resolve_subnet_mask/main.tf

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+resource "google_compute_subnetwork" "subnetwork-resolve-subnet-mask" {
+
+  name             = "subnet-resolve-subnet-mask-test-subnetwork-${local.name_suffix}"
+  region           = "us-west2"
+  ip_cidr_range    = "10.10.0.0/24"
+  purpose          = "PRIVATE"
+  resolve_subnet_mask = "ARP_PRIMARY_RANGE"
+  network          = google_compute_network.custom-test.id
+}
+
+resource "google_compute_network" "custom-test" {
+
+  name                    = "subnet-resolve-subnet-mask-test-network-${local.name_suffix}"
+  auto_create_subnetworks = false
+}

subnetwork_resolve_subnet_mask/motd

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+===
+
+These examples use real resources that will be billed to the
+Google Cloud Platform project you use - so make sure that you
+run "terraform destroy" before quitting!
+
+===

subnetwork_resolve_subnet_mask/tutorial.md

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+# Subnetwork Resolve Subnet Mask - Terraform
+
+## Setup
+
+<walkthrough-author name="rileykarson@google.com" analyticsId="UA-125550242-1" tutorialName="subnetwork_resolve_subnet_mask" repositoryUrl="https://github.com/terraform-google-modules/docs-examples"></walkthrough-author>
+
+Welcome to Terraform in Google Cloud Shell! We need you to let us know what project you'd like to use with Terraform.
+
+<walkthrough-project-billing-setup></walkthrough-project-billing-setup>
+
+Terraform provisions real GCP resources, so anything you create in this session will be billed against this project.
+
+## Terraforming!
+
+Let's use {{project-id}} with Terraform! Click the Cloud Shell icon below to copy the command
+to your shell, and then run it from the shell by pressing Enter/Return. Terraform will pick up
+the project name from the environment variable.
+
+```bash
+export GOOGLE_CLOUD_PROJECT={{project-id}}
+```
+
+After that, let's get Terraform started. Run the following to pull in the providers.
+
+```bash
+terraform init
+```
+
+With the providers downloaded and a project set, you're ready to use Terraform. Go ahead!
+
+```bash
+terraform apply
+```
+
+Terraform will show you what it plans to do, and prompt you to accept. Type "yes" to accept the plan.
+
+```bash
+yes
+```
+
+
+## Post-Apply
+
+### Editing your config
+
+Now you've provisioned your resources in GCP! If you run a "plan", you should see no changes needed.
+
+```bash
+terraform plan
+```
+
+So let's make a change! Try editing a number, or appending a value to the name in the editor. Then,
+run a 'plan' again.
+
+```bash
+terraform plan
+```
+
+Afterwards you can run an apply, which implicitly does a plan and shows you the intended changes
+at the 'yes' prompt.
+
+```bash
+terraform apply
+```
+
+```bash
+yes
+```
+
+## Cleanup
+
+Run the following to remove the resources Terraform provisioned:
+
+```bash
+terraform destroy
+```
+```bash
+yes
+```