EKS template updates

[lamadome]

This is an update to the EKS template. It adds the ability to choose whether or not to deploy the HashiCups applications. It also includes better user feedback and self-documentation.

closes #55 (comment)

[jjti]

I tested the EKS and ECS modules and was able to deploy and order with both

I was also able to list pods:

hcp-ui-templates/eks on git:eks-template-updates ✖︎ [20:50:59]
→ export KUBECONFIG=$(terraform output -raw kubeconfig_filename)

# josh at josh-P6KR9LXL6P in ~/prod/test-hc/terraform-aws-hcp-consul/hcp-ui-templates/eks on git:eks-template-updates ✖︎ [20:51:16]
→ kubectl get pods
NAME                                          READY   STATUS    RESTARTS   AGE
consul-client-ggpmm                           1/1     Running   0          32m
consul-client-hbcks                           1/1     Running   0          32m

[jjti]

Small changes I made:

• returning an absolute path for the kube config

• formatting the nomad files with the TF extension
• pinning the ECS module to one before a breaking change: https://github.com/hashicorp/terraform-aws-consul-ecs/releases/tag/v0.4.2
• disabling EKS auth