Export config from module

[keithmattix]

The current module outputs aren't great; this PR takes a stab at fixing that by exporting the kubeconfig from the controller module.

[keithmattix]

Fixes #65

[keithmattix]

@displague bump on this PR; is there anything else you're looking for?

[keithmattix]

@displague good call outs. I took care of them, except for the variable part of the kubeconfig export; path.root as a default isn't valid

[displague]

I ran into a provisioning problem, @keithmattix:

╷
│ Error: local-exec provisioner error
│
│   with module.controllers.null_resource.kubeconfig,
│   on modules/controller_pool/main.tf line 67, in resource "null_resource" "kubeconfig":
│   67:   provisioner "local-exec" {
│
│ Error running command 'sh modules/controller_pool/assets/kubeconfig_copy.sh': exit status 1. Output: scp: /etc/kubernetes/admin.conf: No such file or directory

Perhaps this is a racing issue?

root@metal-multiarch-k8s-controller-primary:~# ls -latr /etc/kubernetes/admin.conf
-rw------- 1 root root 5592 Nov 10 17:06 /etc/kubernetes/admin.conf

[keithmattix]

@displague I figured it out; there was a race between when Terraform marked the primary node as ready and when the setup script actually finished executing. I added a depends_on and sleep 360 to make sure the node has enough time to init kubeadm

[displague]

Suggested change

	value = module.controllers.kubeconfig
	value = module.controllers.kubeconfig
	sensitive = true

[displague]

Suggested change

	value = data.local_file.kubeconfig
	value = abspath(data.local_file.kubeconfig)