WIP force nftables=true to test in presubmit

Author: rifelpet

upup/pkg/fi/cloudup/new_cluster.go

@@ -1269,12 +1269,14 @@ func setupNetworking(opt *NewClusterOptions, cluster *api.Cluster) error {
 		cluster.Spec.Networking.Kopeio = &api.KopeioNetworkingSpec{}
 	case "flannel", "flannel-vxlan":
 		cluster.Spec.Networking.Flannel = &api.FlannelNetworkingSpec{
-			Backend: "vxlan",
+			Backend:        "vxlan",
+			EnableNFTables: true,
 		}
 	case "flannel-udp":
 		klog.Warningf("flannel UDP mode is not recommended; consider flannel-vxlan instead")
 		cluster.Spec.Networking.Flannel = &api.FlannelNetworkingSpec{
-			Backend: "udp",
+			Backend:        "udp",
+			EnableNFTables: true,
 		}
 	case "calico":
 		cluster.Spec.Networking.Calico = &api.CalicoNetworkingSpec{}