changed vpc data resource for aws_subnet_ids referencing the module vpc id

terraform/aws/control-plane.tf

@@ -2,10 +2,11 @@ locals {
   service = "${var.prefix}-${var.name}-cp"
 }
 
-data "aws_vpc" "main" {
+data "aws_subnet_ids" "private" {
-  filter {
+  vpc_id = "${module.vpc.id}"
-    name   = "tag:Name"
+
-    values = ["${var.prefix}-${var.name}"]
+  tags = {
+    Tier = "Private"
   }
 }