Remove device from (global) discovery on shutdown

Could we add HTTP DELETE support to the discovery server? The intention would be that clients can unregister themselves on shutdown in order to avoid unnecessary dialing attempts on other clients.

I doubt this would have much of a positive effect so I recommend against it. The negatives I see are increased load on the discovery servers, lack of effect due to caching discovery responses, and lack of a significant problem to begin with. :slight_smile: