Allow stopping Google Cloud controller nodes to resize them (#1424)

* Google Cloud requires VMs be stopped in order to update their properties. This is only allowed if explicitly enabled

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

@@ -33,6 +33,7 @@ resource "google_compute_instance" "controllers" {
   # use a zone in the region and wrap around (e.g. controllers > zones)
   zone         = element(local.zones, count.index)
   machine_type = var.controller_type
+  allow_stopping_for_update = true
 
   metadata = {
     user-data = data.ct_config.controllers.*.rendered[count.index]