Add missing controller dependency before bootkube start

* Require the controller module to be completed before starting
to remote exec bootkube start, otherwise its possible the controller
nodes were created, but not the network load balancer

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

@@ -70,7 +70,7 @@ resource "null_resource" "copy-secrets" {
 # Secure copy bootkube assets to ONE controller and start bootkube to perform
 # one-time self-hosted cluster bootstrapping.
 resource "null_resource" "bootkube-start" {
-  depends_on = ["module.bootkube", "module.workers", "null_resource.copy-secrets"]
+  depends_on = ["module.controllers", "module.bootkube", "module.workers", "null_resource.copy-secrets"]
 
   connection {
     type    = "ssh"