Simplify CLC kubeconfig templating on AWS and GCP

* Template terraform-render-bootkube's multi-line kubeconfig
output using the right indentation
* Add `kubeconfig` variable to google-cloud controllers and
workers Terraform submodules
* Remove `kubeconfig_*` variables from google-cloud controllers
and workers Terraform submodules

google-cloud/container-linux/kubernetes/workers/cl/worker.yaml.tmpl

@@ -84,22 +84,7 @@ storage:
       mode: 0644
       contents:
         inline: |
-          apiVersion: v1
-          kind: Config
-          clusters:
-          - name: local
-            cluster:
-              server: ${kubeconfig_server}
-              certificate-authority-data: ${kubeconfig_ca_cert}
-          users:
-          - name: kubelet
-            user:
-              client-certificate-data: ${kubeconfig_kubelet_cert}
-              client-key-data: ${kubeconfig_kubelet_key}
-          contexts:
-          - context:
-              cluster: local
-              user: kubelet
+          ${kubeconfig}
     - path: /etc/kubernetes/kubelet.env
       filesystem: root
       mode: 0644

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

@@ -65,24 +65,7 @@ variable "cluster_domain_suffix" {
   default     = "cluster.local"
 }
 
-# kubeconfig
-
-variable "kubeconfig_ca_cert" {
+variable "kubeconfig" {
   type        = "string"
-  description = "Generated kubeconfig CA certificate"
-}
-
-variable "kubeconfig_kubelet_cert" {
-  type        = "string"
-  description = "Generated kubeconfig kubelet certificate"
-}
-
-variable "kubeconfig_kubelet_key" {
-  type        = "string"
-  description = "Generated kubeconfig kubelet private key"
-}
-
-variable "kubeconfig_server" {
-  type        = "string"
-  description = "Generated kubeconfig server"
+  description = "Generated Kubelet kubeconfig"
 }

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

@@ -22,14 +22,11 @@ data "template_file" "worker_config" {
   template = "${file("${path.module}/cl/worker.yaml.tmpl")}"
 
   vars = {
-    k8s_dns_service_ip      = "${cidrhost(var.service_cidr, 10)}"
-    k8s_etcd_service_ip     = "${cidrhost(var.service_cidr, 15)}"
-    cluster_domain_suffix   = "${var.cluster_domain_suffix}"
-    ssh_authorized_key      = "${var.ssh_authorized_key}"
-    kubeconfig_ca_cert      = "${var.kubeconfig_ca_cert}"
-    kubeconfig_kubelet_cert = "${var.kubeconfig_kubelet_cert}"
-    kubeconfig_kubelet_key  = "${var.kubeconfig_kubelet_key}"
-    kubeconfig_server       = "${var.kubeconfig_server}"
+    k8s_dns_service_ip    = "${cidrhost(var.service_cidr, 10)}"
+    k8s_etcd_service_ip   = "${cidrhost(var.service_cidr, 15)}"
+    cluster_domain_suffix = "${var.cluster_domain_suffix}"
+    ssh_authorized_key    = "${var.ssh_authorized_key}"
+    kubeconfig            = "${indent(10, var.kubeconfig)}"
   }
 }