fix network naming convention in terraform code.

external-network/main.tf

+terraform {
+required_version = ">= 0.14.0"
+  required_providers {
+    openstack = {
+      source  = "terraform-provider-openstack/openstack"
+      version = "~> 1.42.0"
+    }
+  }
+}
+
 # is created as a datasource this module and called in root module
-variable "public_network_name" {type = "string"}
+variable "public_network_name" {type = string}
 
-variable "name" {default = "dmz"}
+#variable "name" {default = "dmz"}
 variable "admin_state_up" {}
 variable "enable_dhcp" {}
-
-
+variable "external_network" {}
 
 data "openstack_networking_network_v2" "public_network" {name = var.public_network_name}
 
 # creates dmznet
 resource "openstack_networking_network_v2" "external_network" {
-  name           = "${var.name}net"
+  name           = "${var.external_network}"
   admin_state_up = var.admin_state_up
 }
 
 resource "openstack_networking_subnet_v2" "external_subnet" {
-  name            = "${var.name}subnet"
+  name            = "${var.external_network}subnet"
   network_id      = openstack_networking_network_v2.external_network.id
   cidr            = "192.168.100.0/24"
   ip_version      = 4
@@ -26,7 +35,7 @@ resource "openstack_networking_subnet_v2" "external_subnet" {
 
 # defines the router dmzrouter using floating ip defined in datasource above to create the external network id
 resource "openstack_networking_router_v2" "router" {
-  name                = "${var.name}router"
+  name                = "${var.external_network}router"
   admin_state_up      = var.admin_state_up
   external_network_id = data.openstack_networking_network_v2.public_network.id
 }