Merge pull request #34551 from deads2k/api-23-remove-legacy-prefixy

Automatic merge from submit-queue

Change legacy API resource registration

Updates the legacy API resource registration to emphasize its different-ness and to simplify supporting objects.  The option has to remain in the genericapiserverconfig for multiple prefixes to enable cases where composers/extenders had composed additional groupless APIs. See OpenShift as an example.

However this is now transparent to "normal" composers.

@ncdc since sttts is out.

test/integration/framework/master_utils.go

@@ -61,6 +61,7 @@ import (
 	"k8s.io/kubernetes/pkg/runtime"
 	"k8s.io/kubernetes/pkg/storage/storagebackend"
 	utilnet "k8s.io/kubernetes/pkg/util/net"
+	"k8s.io/kubernetes/pkg/util/sets"
 	"k8s.io/kubernetes/pkg/util/wait"
 	"k8s.io/kubernetes/pkg/watch"
 	"k8s.io/kubernetes/plugin/pkg/admission/admit"
@@ -348,7 +349,7 @@ func NewMasterConfig() *master.Config {
 	return &master.Config{
 		GenericConfig: &genericapiserver.Config{
 			APIResourceConfigSource: master.DefaultAPIResourceConfigSource(),
-			APIPrefix:               "/api",
+			LegacyAPIGroupPrefixes:  sets.NewString("/api"),
 			APIGroupPrefix:          "/apis",
 			Authorizer:              authorizer.NewAlwaysAllowAuthorizer(),
 			AdmissionControl:        admit.NewAlwaysAdmit(),