nice output for msgBytes

Closes #1227

p2p/conn/connection.go

@@ -523,7 +523,7 @@ FOR_LOOP:
 				break FOR_LOOP
 			}
 			if msgBytes != nil {
-				c.Logger.Debug("Received bytes", "chID", pkt.ChannelID, "msgBytes", msgBytes)
+				c.Logger.Debug("Received bytes", "chID", pkt.ChannelID, "msgBytes", fmt.Sprintf("%X", msgBytes))
 				// NOTE: This means the reactor.Receive runs in the same thread as the p2p recv routine
 				c.onReceive(pkt.ChannelID, msgBytes)
 			}