Ignore lifecycle changes to the AWS controller ami

aws/container-linux/kubernetes/controllers.tf

@@ -36,6 +36,10 @@ resource "aws_instance" "controllers" {
   associate_public_ip_address = true
   subnet_id                   = "${element(aws_subnet.public.*.id, count.index)}"
   vpc_security_group_ids      = ["${aws_security_group.controller.id}"]
+
+  lifecycle {
+    ignore_changes = ["ami"]
+  }
 }
 
 # Controller Container Linux Config