Add both kubeconfig path/file vars to tfvars.example files

[dkeightley]

Resolves: #157

Add kubeconfig path and file vars to tfvars.example files to avoid confusion

[kourosh7]

I added the following to terraform.tfvars based on the modified example:

kube_config_path = "~/.kube"
kube_config_filename = "rancher-terraform.yml"

and it still gives the same error. Look at my terraform output:

$ terraform output
instances_private_ip = [
  [
    "172.31.26.225",
  ],
  [],
]
instances_public_ip = [
  [
    "35.166.95.8",
  ],
  [],
]
kubeconfig_file = "~/.kube"
rancher_bootstrap_password = "initial-admin-password"
rancher_hostname = "rancher.35.166.95.8.sslip.io"
rancher_url = "https://rancher.35.166.95.8.sslip.io"

you can see the kubeconfig_file value is incorrect. It's not appending the filename to the path

As mentioned previously, what works is:
It works fine when:

1. kube_config_path is set to just a filename with no path
2. Not setting any file/path in the terraform.tfvars file at all

[kourosh7]

tested and works. LGTM