lnd: replace 'routing' with 'discovery' package

Add usage of the 'discovery' package in the lnd, now discovery service
will be handle all lnwire announcement messages and send them to the
remote party.

routing/notifications_test.go

@@ -68,10 +68,10 @@ func createTestNode() (*channeldb.LightningNode, error) {
 
 	return &channeldb.LightningNode{
 		LastUpdate: time.Now(),
-		Address:    testAddr,
+		Addresses:  testAddrs,
 		PubKey:     priv.PubKey(),
 		Alias:      alias.String(),
-		Features:  testFeatures,
+		Features:   testFeatures,
 	}, nil
 }