apiserver: Add API emulation versioning.

Co-authored-by: Siyuan Zhang <sizhang@google.com>
Co-authored-by: Joe Betz <jpbetz@google.com>
Co-authored-by: Alex Zielenski <zielenski@google.com>

Signed-off-by: Siyuan Zhang <sizhang@google.com>

test/integration/framework/test_server.go

@@ -35,6 +35,8 @@ import (
 	"k8s.io/apimachinery/pkg/util/wait"
 	genericapiserver "k8s.io/apiserver/pkg/server"
 	genericapiserveroptions "k8s.io/apiserver/pkg/server/options"
+	utilfeature "k8s.io/apiserver/pkg/util/feature"
+	utilversion "k8s.io/apiserver/pkg/util/version"
 	client "k8s.io/client-go/kubernetes"
 	"k8s.io/client-go/rest"
 	"k8s.io/client-go/util/cert"
@@ -135,7 +137,9 @@ func StartTestServer(ctx context.Context, t testing.TB, setup TestServerSetup) (
 		t.Fatalf("write file %s failed: %v", saSigningKeyFile.Name(), err)
 	}
 
-	opts := options.NewServerRunOptions()
+	featureGate := utilfeature.DefaultFeatureGate
+	effectiveVersion := utilversion.DefaultKubeEffectiveVersion()
+	opts := options.NewServerRunOptions(featureGate, effectiveVersion)
 	opts.SecureServing.Listener = listener
 	opts.SecureServing.BindAddress = netutils.ParseIPSloppy("127.0.0.1")
 	opts.SecureServing.ServerCert.CertDirectory = certDir