Add worker_allowed_ports

* [contrib/terraform/openstack] Add worker_allowed_ports

  Allow user to define in terraform template which ports and remote
  IPs that are allowed to access worker nodes. This is useful when you
  don't want to open up whole NodePort range to the outside world, or
  ports outside NodePort range.

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

@@ -73,3 +73,7 @@ variable "supplementary_master_groups" {
 variable "supplementary_node_groups" {
   default = ""
 }
+
+variable "worker_allowed_ports" {
+  type = "list"
+}