Graceful deletion of resources

This commit adds support to core resources to enable deferred deletion
of resources.  Clients may optionally specify a time period after which
resources must be deleted via an object sent with their DELETE. That
object may define an optional grace period in seconds, or allow the
default "preferred" value for a resource to be used. Once the object
is marked as pending deletion, the deletionTimestamp field will be set
and an etcd TTL will be in place.

Clients should assume resources that have deletionTimestamp set will
be deleted at some point in the future.  Other changes will come later
to enable graceful deletion on a per resource basis.

pkg/registry/namespace/etcd/etcd_test.go

@@ -312,7 +312,7 @@ func TestDeleteNamespace(t *testing.T) {
 		},
 	}
 	storage := NewREST(helper)
-	_, err := storage.Delete(api.NewDefaultContext(), "foo")
+	_, err := storage.Delete(api.NewDefaultContext(), "foo", nil)
 	if err != nil {
 		t.Fatalf("unexpected error: %v", err)
 	}

pkg/registry/namespace/registry.go

@@ -44,7 +44,7 @@ type Registry interface {
 // Storage is an interface for a standard REST Storage backend
 // TODO: move me somewhere common
 type Storage interface {
-	apiserver.RESTDeleter
+	apiserver.RESTGracefulDeleter
 	apiserver.RESTLister
 	apiserver.RESTGetter
 	apiserver.ResourceWatcher
@@ -95,6 +95,6 @@ func (s *storage) UpdateNamespace(ctx api.Context, namespace *api.Namespace) err
 }
 
 func (s *storage) DeleteNamespace(ctx api.Context, namespaceID string) error {
-	_, err := s.Delete(ctx, namespaceID)
+	_, err := s.Delete(ctx, namespaceID, nil)
 	return err
 }