Variable to make AWS ELB idle timeout configurable

* we need a longer idle timeout than the default 60s for some tests

terraform/aws/templates/cf_lb.tf

@@ -1,3 +1,8 @@
+variable "elb_idle_timeout" {
+  type = number
+  default = 60
+}
+
 resource "aws_security_group" "cf_ssh_lb_security_group" {
   name        = "${var.env_id}-cf-ssh-lb-security-group"
   description = "CF SSH"
@@ -81,6 +86,8 @@ resource "aws_elb" "cf_ssh_lb" {
     lb_protocol       = "tcp"
   }
 
+  idle_timeout = "${var.elb_idle_timeout}"
+
   security_groups = ["${aws_security_group.cf_ssh_lb_security_group.id}"]
   subnets         = flatten(["${aws_subnet.lb_subnets.*.id}"])
 
@@ -210,6 +217,8 @@ resource "aws_elb" "cf_router_lb" {
     ssl_certificate_id = "${aws_iam_server_certificate.lb_cert.arn}"
   }
 
+  idle_timeout = "${var.elb_idle_timeout}"
+
   security_groups = ["${aws_security_group.cf_router_lb_security_group.id}"]
   subnets         = flatten(["${aws_subnet.lb_subnets.*.id}"])
 
@@ -1024,6 +1033,8 @@ resource "aws_elb" "cf_tcp_lb" {
     lb_protocol       = "tcp"
   }
 
+  idle_timeout = "${var.elb_idle_timeout}"
+
   security_groups = ["${aws_security_group.cf_tcp_lb_security_group.id}"]
   subnets         = flatten(["${aws_subnet.lb_subnets.*.id}"])