Errors that are non-recoverable can lead to one of two things happening:
1. That connection lying dead and cloudflared not retrying to make that
connection.
2. cloudflared resolving to a different edge addr to retry connection.
We should subject these errors to a backoff as well. This will result in
us introducing a backoff for 1. When we are going to let the connection
become stale anyway and 2. When we are about to try a different edge
addr.
Nuno Diegues
Sudarsan Reddy
João Oliveirinha
cthuang