Settle on a name for descriptors
As discussed on #14784 we call self-published descriptors quite a few things...
- 'GETINFO desc/*' and Stem call the main self-published descriptors server descriptors. Metrics also uses a "server-descriptor 1.0" annotation for them.
- The dir-spec calls them router descriptors... usually. It opts for 'server descriptor' in section 6.2.
- CollecTor calls them relay descriptors.
Having three different names is confusing for new contributors and... well, us too. We should standardize on a name.
This primarily straddles Tor's spec, Stem, and CollecTor. Personally I'd like for us to standardize on server descriptors because it's codified in the Metrics annotation and classes Stem vends.
Karsten, Nick: any objections? If not then I'm happy to provide a spec patch and file a CollecTor ticket for this.