Update go dependencies

vendor/k8s.io/kubernetes/pkg/cloudprovider/plugins.go

@@ -37,6 +37,8 @@ var (
 	providers      = make(map[string]Factory)
 )
 
+const externalCloudProvider = "external"
+
 // RegisterCloudProvider registers a cloudprovider.Factory by name.  This
 // is expected to happen during app startup.
 func RegisterCloudProvider(name string, cloud Factory) {
@@ -71,7 +73,7 @@ func CloudProviders() []string {
 }
 
 // GetCloudProvider creates an instance of the named cloud provider, or nil if
-// the name is not known.  The error return is only used if the named provider
+// the name is unknown.  The error return is only used if the named provider
 // was known but failed to initialize. The config parameter specifies the
 // io.Reader handler of the configuration file for the cloud provider, or nil
 // for no configuation.
@@ -85,6 +87,11 @@ func GetCloudProvider(name string, config io.Reader) (Interface, error) {
 	return f(config)
 }
 
+// Detects if the string is an external cloud provider
+func IsExternal(name string) bool {
+	return name == externalCloudProvider
+}
+
 // InitCloudProvider creates an instance of the named cloud provider.
 func InitCloudProvider(name string, configFilePath string) (Interface, error) {
 	var cloud Interface
@@ -95,6 +102,11 @@ func InitCloudProvider(name string, configFilePath string) (Interface, error) {
 		return nil, nil
 	}
 
+	if IsExternal(name) {
+		glog.Info("External cloud provider specified")
+		return nil, nil
+	}
+
 	if configFilePath != "" {
 		var config *os.File
 		config, err = os.Open(configFilePath)