cleanup compute module variable file

Author: sjpb

environments/skeleton/{{cookiecutter.environment}}/terraform/compute/variables.tf

@@ -1,6 +1,9 @@
+# NB: Only variables which may be set directly on the compute group are
+# have descriptions here (and defaults if optional) - others are just passed in
+
 variable "nodes" {
     type = list(string)
-    description = "list of node names for partition"
+    description = "List of node names for this compute group"
 }
 
 variable "flavor" {
@@ -14,7 +17,6 @@ variable "cluster_name" {
 
 variable "cluster_domain_suffix" {
     type = string
-    default = "invalid"
 }
 
 variable "cluster_net_id" {
@@ -27,28 +29,26 @@ variable "cluster_subnet_id" {
 
 variable "key_pair" {
     type = string
-    description = "Name of an existing keypair in OpenStack"
 }
 
 variable "image_id" {
     type = string
-    description = "ID of image for the partition"
+    description = "ID of image for this compute node group"
 }
 
 variable "environment_root" {
     type = string
-    description = "Path to environment root, automatically set by activate script"
 }
 
 variable "vnic_type" {
     type = string
-    description = "VNIC type, see https://registry.terraform.io/providers/terraform-provider-openstack/openstack/latest/docs/resources/networking_port_v2#vnic_type"
+    description = "VNIC type for this compute group, see https://registry.terraform.io/providers/terraform-provider-openstack/openstack/latest/docs/resources/networking_port_v2#vnic_type"
     default = "normal"
 }
 
 variable "vnic_profile" {
     type = string
-    description = "VNIC binding profile as json string, see https://registry.terraform.io/providers/terraform-provider-openstack/openstack/latest/docs/resources/networking_port_v2#profile."
+    description = "VNIC binding profile for this compute group as json string, see https://registry.terraform.io/providers/terraform-provider-openstack/openstack/latest/docs/resources/networking_port_v2#profile."
     default = "{}"
 }
 
@@ -73,7 +73,6 @@ variable "k3s_token" {
 }
 
 variable "k3s_server" {
-    description = "Name/address of k3s server"
     type = string
 }