[REMOTE] Authenticate access to remote clusters with service accounts instead of kubeconfigs(tokens frequently expire, leading to frequent re-downloads/headaches)

[cbmckni]

Users should only need to submit authentication info once for each remote cluster.

As kubeconfig security tokens expire, service accounts should instead be used, as server-server communication is what they are designed for.

Nextflow-API should be configured to use service accounts on external clusters, as an option

[bentsherman]

Closing, refer to the discussion in #16.