log: revert a log back to trace level (#1528)

warning level will make the log spam over the screen.

p2p/peer.go

@@ -435,7 +435,7 @@ func (p *Peer) startProtocols(writeStart <-chan struct{}, writeErr chan<- error)
 				p.log.Trace(fmt.Sprintf("Protocol %s/%d returned", proto.Name, proto.Version))
 				err = errProtocolReturned
 			} else if !errors.Is(err, io.EOF) {
-				p.log.Warn(fmt.Sprintf("Protocol %s/%d failed", proto.Name, proto.Version), "err", err)
+				p.log.Trace(fmt.Sprintf("Protocol %s/%d failed", proto.Name, proto.Version), "err", err)
 			}
 			p.protoErr <- err
 		}()