Nomad Service Discovery uses an in-memory buffered pipe implementation
to connect consul-template to the Nomad API.
This adds a basic test for that helper functionality.
This change modifies the template task runner to utilise the
new consul-template which includes Nomad service lookup template
funcs.
In order to provide security and auth to consul-template, we use
a custom HTTP dialer which is passed to consul-template when
setting up the runner. This method follows Vault implementation.
Co-authored-by: Michael Schurter <mschurter@hashicorp.com>
