add node shutdown taint

shutdowned -> stopped

use shutdown everywhere

use patch in taints api call

use notimplemented in clouds use AddOrUpdateTaintOnNode

correct log text

add fake cloud

try to fix bazel

add shutdown tests

add context

pkg/cloudprovider/cloud.go

@@ -148,6 +148,8 @@ type Instances interface {
 	// InstanceExistsByProviderID returns true if the instance for the given provider id still is running.
 	// If false is returned with no error, the instance will be immediately deleted by the cloud controller manager.
 	InstanceExistsByProviderID(ctx context.Context, providerID string) (bool, error)
+	// InstanceShutdownByProviderID returns true if the instance is shutdown in cloudprovider
+	InstanceShutdownByProviderID(ctx context.Context, providerID string) (bool, error)
 }
 
 // Route is a representation of an advanced routing rule.