Stop exposing v1beta3 by default

pkg/api/registered/registered.go

@@ -35,7 +35,7 @@ func init() {
 	}
 
 	// The default list of supported api versions, in order of most preferred to the least.
-	defaultSupportedVersions := "v1,v1beta3"
+	defaultSupportedVersions := "v1"
 	// Env var KUBE_API_VERSIONS is a comma separated list of API versions that should be registered in the scheme.
 	// The versions should be in the order of most preferred to the least.
 	supportedVersions := os.Getenv("KUBE_API_VERSIONS")