Refactor out protocol and luhn (protocol dependency) packages

cmd/stindex/main.go

@@ -21,8 +21,8 @@ import (
 	"log"
 	"os"
 
+	"github.com/syncthing/protocol"
 	"github.com/syncthing/syncthing/internal/db"
-	"github.com/syncthing/syncthing/internal/protocol"
 	"github.com/syndtr/goleveldb/leveldb"
 )