Further fixes for TF0.15

* proxy needs aws_region

To be tagged v1.24.1

base/proxy_server/main.tf

@@ -176,6 +176,7 @@ data "template_file" "cloud_init" {
     proxy = var.proxy
     aws_partition = var.aws_partition
     aws_partition_alias = var.aws_partition_alias
+    aws_region = var.aws_region
   }
 }