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/ips/main.tf

@@ -0,0 +1,24 @@
+
+resource "null_resource" "dummy_dependency" {
+  triggers {
+    dependency_id = "${var.router_id}"
+  }
+}
+
+resource "openstack_networking_floatingip_v2" "k8s_master" {
+    count = "${var.number_of_k8s_masters}"
+    pool = "${var.floatingip_pool}"
+    depends_on = ["null_resource.dummy_dependency"]
+}
+
+resource "openstack_networking_floatingip_v2" "k8s_node" {
+    count = "${var.number_of_k8s_nodes}"
+    pool = "${var.floatingip_pool}"
+    depends_on = ["null_resource.dummy_dependency"]
+}
+
+resource "openstack_networking_floatingip_v2" "bastion" {
+    count = "${var.number_of_bastions}"
+    pool = "${var.floatingip_pool}"
+    depends_on = ["null_resource.dummy_dependency"]
+}