Adding the subnet_ids data resource back in.

terraform/aws/control-plane.tf

@@ -2,13 +2,12 @@ locals {
   service = "${var.prefix}-${var.name}-cp"
 }
 
-# data "aws_subnet_ids" "private" {
-#   vpc_id = "${module.vpc.vpc_id}"
-#   tags = {
-#     Name = "private-${var.prefix}-${var.name}"
-#     Tier = "Private"
-#   }
-# }
+data "aws_subnet_ids" "private" {
+  vpc_id = "${module.vpc.vpc_id}"
+  tags = {
+    Tier = "Private"
+  }
+}
 
 data "aws_ami" "base" {
   owners           = ["self"]