bare-metal: Remove support for experimental_self_hosted_etcd

* Transition from discouraging self-hosted etcd for bare-metal,
to removing it as an option
* See #13 and FAQ for self-hosted etcd discussion

bare-metal/container-linux/kubernetes/bootkube.tf

@@ -10,5 +10,4 @@ module "bootkube" {
   network_mtu                   = "${var.network_mtu}"
   pod_cidr                      = "${var.pod_cidr}"
   service_cidr                  = "${var.service_cidr}"
-  experimental_self_hosted_etcd = "${var.experimental_self_hosted_etcd}"
 }

bare-metal/container-linux/kubernetes/cl/controller.yaml.tmpl

@@ -1,7 +1,6 @@
 ---
 systemd:
   units:
-    {{ if eq .etcd_on_host "true" }}
     - name: etcd-member.service
       enable: true
       dropins:
@@ -25,7 +24,6 @@ systemd:
             Environment="ETCD_PEER_CERT_FILE=/etc/ssl/certs/etcd/peer.crt"
             Environment="ETCD_PEER_KEY_FILE=/etc/ssl/certs/etcd/peer.key"
             Environment="ETCD_PEER_CLIENT_CERT_AUTH=true"
-    {{ end }}
     - name: docker.service
       enable: true
     - name: locksmithd.service

bare-metal/container-linux/kubernetes/groups.tf

@@ -23,10 +23,6 @@ resource "matchbox_group" "controller" {
     mac = "${element(var.controller_macs, count.index)}"
     os  = "installed"
   }
-
-  metadata {
-    etcd_on_host = "${var.experimental_self_hosted_etcd ? "false" : "true"}"
-  }
 }
 
 resource "matchbox_group" "worker" {

bare-metal/container-linux/kubernetes/variables.tf

@@ -109,8 +109,3 @@ variable "container_linux_oem" {
   default     = ""
   description = "Specify an OEM image id to use as base for the installation (e.g. ami, vmware_raw, xen) or leave blank for the default image"
 }
-
-variable "experimental_self_hosted_etcd" {
-  default     = "false"
-  description = "Create self-hosted etcd cluster as pods on Kubernetes, instead of on-hosts"
-}