First step towards removing Tracker Driver.

This feature isn't worth maintaining and if anyone needs to scale beyond
memory on a single box, we can evaluate it then.
Respect a clients AF Optional Support - config driven
Disable HTTP KeepAlives
Unlock torrent mutex when continuing purge loop.
Address missing copyright on storage.go [ci skip]
Add configurable HTTP read and write timeouts
go fmt [ci skip]
AppendPeers now uses readlock.