Better examples, PR template changes, general tidy up (#375)

* adding 3 examples

* removing old example

* updating PR template

* fix this typo

* update after renaming default example

* add missing launch_template_mixed stuff to aws_auth

* fix 2 examples with public subnets

* update changelog for new minor release

examples/spot_instances/main.tf

@@ -0,0 +1,60 @@
+terraform {
+  required_version = ">= 0.11.8"
+}
+
+provider "aws" {
+  version = ">= 2.6.0"
+  region  = "${var.region}"
+}
+
+provider "random" {
+  version = "= 1.3.1"
+}
+
+data "aws_availability_zones" "available" {}
+
+locals {
+  cluster_name = "test-eks-spot-${random_string.suffix.result}"
+}
+
+resource "random_string" "suffix" {
+  length  = 8
+  special = false
+}
+
+module "vpc" {
+  source         = "terraform-aws-modules/vpc/aws"
+  version        = "1.60.0"
+  name           = "test-vpc-spot"
+  cidr           = "10.0.0.0/16"
+  azs            = ["${data.aws_availability_zones.available.names}"]
+  public_subnets = ["10.0.4.0/24", "10.0.5.0/24", "10.0.6.0/24"]
+
+  tags = {
+    "kubernetes.io/cluster/${local.cluster_name}" = "shared"
+  }
+}
+
+module "eks" {
+  source                                   = "../.."
+  cluster_name                             = "${local.cluster_name}"
+  subnets                                  = ["${module.vpc.public_subnets}"]
+  vpc_id                                   = "${module.vpc.vpc_id}"
+  worker_group_count                       = 0
+  worker_group_launch_template_mixed_count = 1
+
+  worker_groups_launch_template_mixed = [
+    {
+      name                     = "spot-1"
+      override_instance_type_1 = "m5.large"
+      override_instance_type_2 = "c5.large"
+      override_instance_type_3 = "t3.large"
+      override_instance_type_4 = "r5.large"
+      spot_instance_pools      = 4
+      asg_max_size             = 5
+      asg_desired_capacity     = 5
+      kubelet_extra_args       = "--node-labels=kubernetes.io/lifecycle=spot"
+      public_ip                = true
+    },
+  ]
+}

examples/spot_instances/outputs.tf

@@ -0,0 +1,24 @@
+output "cluster_endpoint" {
+  description = "Endpoint for EKS control plane."
+  value       = "${module.eks.cluster_endpoint}"
+}
+
+output "cluster_security_group_id" {
+  description = "Security group ids attached to the cluster control plane."
+  value       = "${module.eks.cluster_security_group_id}"
+}
+
+output "kubectl_config" {
+  description = "kubectl config as generated by the module."
+  value       = "${module.eks.kubeconfig}"
+}
+
+output "config_map_aws_auth" {
+  description = "A kubernetes configuration to authenticate to this EKS cluster."
+  value       = "${module.eks.config_map_aws_auth}"
+}
+
+output "region" {
+  description = "AWS region."
+  value       = "${var.region}"
+}

examples/spot_instances/variables.tf

@@ -0,0 +1,3 @@
+variable "region" {
+  default = "us-west-2"
+}