servers should support hearing "not new descriptor"

Directory authorities, when they get a descriptor that isn't new enough (more than cosmetically different) right now send back a 200 response code.

We should send some different code, so servers have a chance of knowing whether their uploaded descriptor actually "took" or was silently discarded.

So, changes as I understand them: A) Tor servers should accept 200-299 as successes, not just 200.

B) What success code, within the range 201-299, most closely resembles "I accepted it but it wasn't new enough so I didn't use it"? Is there any precedent to follow here?

C) Once step A is done, authorities can start sending back other codes.

D) Is there any way to speed up reaching step C?

E) Should we also change 400 to a range 400-499?

[Automatically added by flyspray2trac: Operating System: All]