Stop serving deprecated extensions/v1beta1 APIs by default

From the 1.7 release notes:
NetworkPolicy has been moved from extensions/v1beta1 to the new (kubernetes#39164, @danwinship) networking.k8s.io/v1 API group.

From the 1.8 release notes:
The Deployment, DaemonSet, and ReplicaSet kinds in the extensions/v1beta1 group version are now deprecated, as are the Deployment, StatefulSet, and ControllerRevision kinds in apps/v1beta1. As they will not be removed until after a GA version becomes available, you may continue to use these kinds in existing code. However, all new code should be developed against the apps/v1beta2 group version

This PR disables these extensions/v1beta1 resources from being served by default in 1.10, though they can be re-enabled via --runtime-config.

Objects already stored in etcd in extensions/v1beta1 format can still be read

pkg/master/master.go

@@ -489,11 +489,7 @@ func DefaultAPIResourceConfigSource() *serverstorage.ResourceConfig {
 
 	// all extensions resources except these are disabled by default
 	ret.EnableResources(
-		extensionsapiv1beta1.SchemeGroupVersion.WithResource("daemonsets"),
-		extensionsapiv1beta1.SchemeGroupVersion.WithResource("deployments"),
 		extensionsapiv1beta1.SchemeGroupVersion.WithResource("ingresses"),
-		extensionsapiv1beta1.SchemeGroupVersion.WithResource("networkpolicies"),
-		extensionsapiv1beta1.SchemeGroupVersion.WithResource("replicasets"),
 		extensionsapiv1beta1.SchemeGroupVersion.WithResource("podsecuritypolicies"),
 	)