[contrib] terraform openstack: allow disabling port security (#8410)

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

@@ -10,6 +10,10 @@ variable "dns_nameservers" {
   type = list
 }
 
+variable "port_security_enabled" {
+  type = bool
+}
+
 variable "subnet_cidr" {}
 
 variable "use_neutron" {}