Merge #3535

3535: Avoid ordering peers based on peerid in blockfetch r=karknu a=karknu

Peers where ordered based on SockAddr, which generally meant that all
peers would pick the same second choice peer to download blocks from in
Deadline mode. And the same third pick and so on.

This changes ranking so that peers are sorted based on G.

Co-authored-by: Karl Knutsson <[email protected]>

Author: iohk-bors[bot]