Replace Critical{,f} with Error{,f}

Except when there is an explicit os.Exit(1) after the Critical line,
then replace with Fatal{,f}.
golang's log and logrus already call os.Exit(1) by default with Fatal.

License: MIT
Signed-off-by: rht <rhtbot@gmail.com>

routing/dht/handlers.go

@@ -89,7 +89,7 @@ func (dht *IpfsDHT) handleGetValue(ctx context.Context, p peer.ID, pmes *pb.Mess
 		for _, pi := range closerinfos {
 			log.Debugf("handleGetValue returning closer peer: '%s'", pi.ID)
 			if len(pi.Addrs) < 1 {
-				log.Criticalf(`no addresses on peer being sent!
+				log.Errorf(`no addresses on peer being sent!
 					[local:%s]
 					[sending:%s]
 					[remote:%s]`, dht.self, pi.ID, p)