multi: switch over import paths from roasbeef/* to btcsuite/*

discovery/utils.go

@@ -5,7 +5,7 @@ import (
 	"github.com/lightningnetwork/lnd/channeldb"
 	"github.com/lightningnetwork/lnd/lnwallet"
 	"github.com/lightningnetwork/lnd/lnwire"
-	"github.com/roasbeef/btcd/btcec"
+	"github.com/btcsuite/btcd/btcec"
 )
 
 // CreateChanAnnouncement is a helper function which creates all channel