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/variables.tf

@@ -0,0 +1,26 @@
+variable "number_of_k8s_masters" {
+}
+
+variable "number_of_k8s_masters_no_etcd" {
+}
+
+variable "number_of_k8s_nodes" {
+}
+
+variable "floatingip_pool" {
+}
+
+variable "number_of_bastions" {
+
+ }
+
+variable "external_net" {
+
+}
+
+variable "network_name" {
+}
+
+variable "router_id"{
+
+}