Remove Haswell minimum CPU platform requirement

* Google Cloud API implements `min_cpu_platform` to mean
"use exactly this CPU"
* Fix error creating clusters in newer regions lacking Haswell
platform (e.g. europe-west2) (#438)
* Reverts #405, added in v1.13.4
* Original goal of ignoring old Ivy/Sandy bridge CPUs in older regions
will be achieved shortly anyway. Google Cloud is deprecating those CPUs
in April 2019
* https://cloud.google.com/compute/docs/instances/specify-min-cpu-platform#how_selecting_a_minimum_cpu_platform_works

CHANGES.md

@@ -4,6 +4,12 @@ Notable changes between versions.
 
 ## Latest
 
+#### Google Cloud
+
+* Remove Haswell minimum CPU platform requirement ([#439](https://github.com/poseidon/typhoon/pull/439))
+  * Google Cloud API implements `min_cpu_platform` to mean "use exactly this CPU". Revert [#405](https://github.com/poseidon/typhoon/pull/405) added in v1.13.4.
+  * Fix error creating clusters in new regions without Haswell (e.g. europe-west2) ([#438](https://github.com/poseidon/typhoon/issues/438))
+
 ## v1.13.5
 
 * Kubernetes [v1.13.5](https://github.com/kubernetes/kubernetes/blob/master/CHANGELOG-1.13.md#v1135)

google-cloud/container-linux/kubernetes/controllers.tf

@@ -34,7 +34,6 @@ resource "google_compute_instance" "controllers" {
   name         = "${var.cluster_name}-controller-${count.index}"
   zone         = "${element(local.zones, count.index)}"
   machine_type = "${var.controller_type}"
-  min_cpu_platform = "Intel Haswell"
 
   metadata = {
     user-data = "${element(data.ct_config.controller-ignitions.*.rendered, count.index)}"

google-cloud/container-linux/kubernetes/workers/workers.tf

@@ -26,7 +26,6 @@ resource "google_compute_instance_template" "worker" {
   name_prefix  = "${var.name}-worker-"
   description  = "Worker Instance template"
   machine_type = "${var.machine_type}"
-  min_cpu_platform = "Intel Haswell"
 
   metadata = {
     user-data = "${data.ct_config.worker-ignition.rendered}"

google-cloud/fedora-atomic/kubernetes/controllers.tf

@@ -34,7 +34,6 @@ resource "google_compute_instance" "controllers" {
   name         = "${var.cluster_name}-controller-${count.index}"
   zone         = "${element(local.zones, count.index)}"
   machine_type = "${var.controller_type}"
-  min_cpu_platform = "Intel Haswell"
 
   metadata = {
     user-data = "${element(data.template_file.controller-cloudinit.*.rendered, count.index)}"

google-cloud/fedora-atomic/kubernetes/workers/workers.tf

@@ -26,7 +26,6 @@ resource "google_compute_instance_template" "worker" {
   name_prefix  = "${var.name}-worker-"
   description  = "Worker Instance template"
   machine_type = "${var.machine_type}"
-  min_cpu_platform = "Intel Haswell"
 
   metadata = {
     user-data = "${data.template_file.worker-cloudinit.rendered}"