Adding aws_iam_service_linked_role to fix ELB creation error (#91)

* adding aws_iam_service_linked_role to fix ELB creation error

* setting default to false

* updating changelog

* moving resource to cluster.tf file

variables.tf

@@ -22,6 +22,11 @@ variable "write_kubeconfig" {
   default     = true
 }
 
+variable "create_elb_service_linked_role" {
+  description = "Whether to create the service linked role for the elasticloadbalancing service. Without this EKS cannot create ELBs."
+  default     = false
+}
+
 variable "manage_aws_auth" {
   description = "Whether to write and apply the aws-auth configmap file."
   default     = true