Generate kubeconfig as recommended by GKE

template_file.kubeconfig is creating a kubeconfig file, which relies on token for it's credentials. This isn't the method recommended by Google.

Need to generate kubeconfig file based on the following document:

• Authenticating to the Kubernetes API server

Specifically, what is needed if documented in the above doc in the "Environments without gcloud" section, namely:

• Step 5 in doc - Modify kubeconfig generation in gke-cluster Terraform module to conform to this format.