les: switch to new discv5 (#21940)

This PR enables running the new discv5 protocol in both LES client
and server mode. In client mode it mixes discv5 and dnsdisc iterators
(if both are enabled) and filters incoming ENRs for "les" tag and fork ID.
The old p2p/discv5 package and all references to it are removed.

Co-authored-by: Felix Lange <fjl@twurst.com>

cmd/utils/flags.go

@@ -59,7 +59,6 @@ import (
 	"github.com/ethereum/go-ethereum/miner"
 	"github.com/ethereum/go-ethereum/node"
 	"github.com/ethereum/go-ethereum/p2p"
-	"github.com/ethereum/go-ethereum/p2p/discv5"
 	"github.com/ethereum/go-ethereum/p2p/enode"
 	"github.com/ethereum/go-ethereum/p2p/nat"
 	"github.com/ethereum/go-ethereum/p2p/netutil"
@@ -842,7 +841,7 @@ func setBootstrapNodes(ctx *cli.Context, cfg *p2p.Config) {
 // setBootstrapNodesV5 creates a list of bootstrap nodes from the command line
 // flags, reverting to pre-configured ones if none have been specified.
 func setBootstrapNodesV5(ctx *cli.Context, cfg *p2p.Config) {
-	urls := params.MainnetBootnodes
+	urls := params.V5Bootnodes
 	switch {
 	case ctx.GlobalIsSet(BootnodesFlag.Name) || ctx.GlobalIsSet(LegacyBootnodesV5Flag.Name):
 		if ctx.GlobalIsSet(LegacyBootnodesV5Flag.Name) {
@@ -850,22 +849,14 @@ func setBootstrapNodesV5(ctx *cli.Context, cfg *p2p.Config) {
 		} else {
 			urls = SplitAndTrim(ctx.GlobalString(BootnodesFlag.Name))
 		}
-	case ctx.GlobalBool(RopstenFlag.Name):
-		urls = params.RopstenBootnodes
-	case ctx.GlobalBool(RinkebyFlag.Name):
-		urls = params.RinkebyBootnodes
-	case ctx.GlobalBool(GoerliFlag.Name):
-		urls = params.GoerliBootnodes
-	case ctx.GlobalBool(YoloV2Flag.Name):
-		urls = params.YoloV2Bootnodes
 	case cfg.BootstrapNodesV5 != nil:
 		return // already set, don't apply defaults.
 	}
 
-	cfg.BootstrapNodesV5 = make([]*discv5.Node, 0, len(urls))
+	cfg.BootstrapNodesV5 = make([]*enode.Node, 0, len(urls))
 	for _, url := range urls {
 		if url != "" {
-			node, err := discv5.ParseNode(url)
+			node, err := enode.Parse(enode.ValidSchemes, url)
 			if err != nil {
 				log.Error("Bootstrap URL invalid", "enode", url, "err", err)
 				continue