Add delay to refresh cycle with patch

_assets/patches/geth/0036-add-delay-to-refresh-cycle.patch

@@ -0,0 +1,13 @@
+diff --git a/p2p/discv5/net.go b/p2p/discv5/net.go
+index d0eae28f..113dabc8 100644
+--- a/p2p/discv5/net.go
++++ b/p2p/discv5/net.go
+@@ -678,7 +678,7 @@ func (net *Network) refresh(done chan<- struct{}) {
+ 	}
+ 	if len(seeds) == 0 {
+ 		log.Trace("no seed nodes found")
+-		close(done)
++		time.AfterFunc(time.Second*10, func() { close(done) })
+ 		return
+ 	}
+ 	for _, n := range seeds {

vendor/github.com/ethereum/go-ethereum/p2p/discv5/net.go

@@ -678,7 +678,7 @@ func (net *Network) refresh(done chan<- struct{}) {
 	}
 	if len(seeds) == 0 {
 		log.Trace("no seed nodes found")
-		close(done)
+		time.AfterFunc(time.Second*10, func() { close(done) })
 		return
 	}
 	for _, n := range seeds {