add az_list_node variable to specify different AZs for kubelets (#5413)

* rebase and add az_list_node variable to specify different AZs for kubelets

* fix missing variable name change

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

@@ -1,7 +1,11 @@
 variable "cluster_name" {}
 
 variable "az_list" {
-  type = "list"
+  type = list(string)
+}
+
+variable "az_list_node" {
+  type = list(string)
 }
 
 variable "number_of_k8s_masters" {}
@@ -110,4 +114,4 @@ variable "use_access_ip" {}
 
 variable "use_server_groups" {
   type = bool
-}
+}