suppress p2p.ErrAlreadyConnected log when connecting to bootnodes (#318)

* suppress p2p.ErrAlreadyConnected log when connecting to bootnodes, adjust debug log in kademlia

pkg/kademlia/kademlia.go

@@ -149,7 +149,7 @@ func (k *Kad) manage() {
 
 				err = k.connect(ctx, peer, bzzAddr.Underlay, po)
 				if err != nil {
-					k.logger.Debugf("error connecting to peer from kademlia %s %s: %v", peer, bzzAddr, err)
+					k.logger.Debugf("error connecting to peer from kademlia %s: %v", bzzAddr.String(), err)
 					k.logger.Errorf("connecting to peer %s: %v", bzzAddr.ShortString(), err)
 					// continue to next
 					return false, false, nil

pkg/node/node.go

@@ -6,6 +6,7 @@ package node
 
 import (
 	"context"
+	"errors"
 	"fmt"
 	"io"
 	"log"
@@ -378,8 +379,10 @@ func NewBee(o Options) (*Bee, error) {
 					logger.Tracef("connecting to peer %s", addr)
 					bzzAddr, err := p2ps.Connect(p2pCtx, addr)
 					if err != nil {
+						if !errors.Is(err, p2p.ErrAlreadyConnected) {
 							logger.Debugf("connect fail %s: %v", addr, err)
 							logger.Errorf("connect to bootnode %s", addr)
+						}
 						return false, nil
 					}
 					logger.Tracef("connected to peer %s", addr)