Update OpenStack Terraform: Modules, Bastions, and New Floating IP config (#1958)

* Adding bastion and private network provisioning for openstack terraform

* Remove usage of floating-ip property

* Combine openstack instances + floating ips

* Fix relating floating IPs to hosts for openstack builds

* Tighten up security groups

Allow ssh into all instances with floating IP

* Add the gluster hosts to the no-floating group

* Break terraform into modules

* Update README and var descriptions to match current config

* Remove volume property in gluster compute def

* Include cluster name in internal network and router names

* Make dns_nameservers a variable

contrib/terraform/openstack/modules/network/main.tf

@@ -0,0 +1,24 @@
+
+resource "openstack_networking_router_v2" "k8s" {
+  name             = "${var.cluster_name}-router"
+  admin_state_up   = "true"
+  external_gateway = "${var.external_net}"
+}
+
+resource "openstack_networking_network_v2" "k8s" {
+  name           = "${var.network_name}"
+  admin_state_up = "true"
+}
+
+resource "openstack_networking_subnet_v2" "k8s" {
+  name            = "${var.cluster_name}-internal-network"
+  network_id      = "${openstack_networking_network_v2.k8s.id}"
+  cidr            = "10.0.0.0/24"
+  ip_version      = 4
+  dns_nameservers = "${var.dns_nameservers}"
+}
+
+resource "openstack_networking_router_interface_v2" "k8s" {
+  router_id = "${openstack_networking_router_v2.k8s.id}"
+  subnet_id = "${openstack_networking_subnet_v2.k8s.id}"
+}

contrib/terraform/openstack/modules/network/outputs.tf

@@ -0,0 +1,7 @@
+output "router_id" {
+    value = "${openstack_networking_router_interface_v2.k8s.id}"
+}
+
+output "network_id" {
+    value = "${openstack_networking_subnet_v2.k8s.id}"
+}

contrib/terraform/openstack/modules/network/variables.tf

@@ -0,0 +1,13 @@
+variable "external_net" {
+
+}
+
+variable "network_name" {
+}
+
+variable "cluster_name" {
+}
+
+variable "dns_nameservers"{
+  type = "list"
+}