use the quic.Config to set the QUIC version in the Chrome tests

integrationtests/tools/testserver/server.go

@@ -7,7 +7,9 @@ import (
 	"net/http"
 	"strconv"
 
+	quic "github.com/lucas-clemente/quic-go"
 	"github.com/lucas-clemente/quic-go/h2quic"
+	"github.com/lucas-clemente/quic-go/internal/protocol"
 	"github.com/lucas-clemente/quic-go/internal/testdata"
 
 	. "github.com/onsi/ginkgo"
@@ -75,11 +77,16 @@ func GeneratePRData(l int) []byte {
 	return res
 }
 
-func StartQuicServer() {
+// StartQuicServer starts a h2quic.Server.
+// versions is a slice of supported QUIC versions. It may be nil, then all supported versions are used.
+func StartQuicServer(versions []protocol.VersionNumber) {
 	server = &h2quic.Server{
 		Server: &http.Server{
 			TLSConfig: testdata.GetTLSConfig(),
 		},
+		QuicConfig: &quic.Config{
+			Versions: versions,
+		},
 	}
 
 	addr, err := net.ResolveUDPAddr("udp", "0.0.0.0:0")