Add app version for Region Instance Group Manager

[nimajalali]

Fixes the following error during tf plan

Error: "instance_template": this field cannot be set

  on .terraform/modules/nomad_clients/terraform-google-nomad-0.1.1/modules/nomad-cluster/main.tf line 15, in resource "google_compute_region_instance_group_manager" "nomad":
  15: resource "google_compute_region_instance_group_manager" "nomad" {



Error: "version": required field is not set

  on .terraform/modules/nomad_clients/terraform-google-nomad-0.1.1/modules/nomad-cluster/main.tf line 15, in resource "google_compute_region_instance_group_manager" "nomad":
  15: resource "google_compute_region_instance_group_manager" "nomad" {

[hashicorp-cla]

All committers have signed the CLA.

[tomstockton]

This module appears to be broken without this fix. A similar issue is outstanding for the consul module.

[MrYawe]

@robmorgan @josh-padnick Any updates on this?