improve IAM module

Signed-off-by: hongming <talonwan@yunify.com>

vendor/k8s.io/client-go/discovery/discovery_client.go

@@ -463,6 +463,13 @@ func setDiscoveryDefaults(config *restclient.Config) error {
 	if config.Timeout == 0 {
 		config.Timeout = defaultTimeout
 	}
+	if config.Burst == 0 && config.QPS < 100 {
+		// discovery is expected to be bursty, increase the default burst
+		// to accommodate looking up resource info for many API groups.
+		// matches burst set by ConfigFlags#ToDiscoveryClient().
+		// see https://issue.k8s.io/86149
+		config.Burst = 100
+	}
 	codec := runtime.NoopEncoder{Decoder: scheme.Codecs.UniversalDecoder()}
 	config.NegotiatedSerializer = serializer.NegotiatedSerializerWrapper(runtime.SerializerInfo{Serializer: codec})
 	if len(config.UserAgent) == 0 {