Cache tickets on gateway #25
Description
Right now the gateway fetches the ticket for each incoming request (TCP connection). It should instead cache the tickets. The question is for how long, though.
It's not super important, because this whole ticket fetching business will soon be removed from the gateway, instead envoy on the Datum side will have to fetch the upstream endpoint id and authority from the Datum API and then will set this in headers, so the gateway will be stateless then.