Add providerless tags

cmd/cloud-controller-manager/providers.go

@@ -0,0 +1,32 @@
+// +build !providerless
+
+/*
+Copyright 2020 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+// The external controller manager is responsible for running controller loops that
+// are cloud provider dependent. It uses the API to listen to new events on resources.
+
+package main
+
+import (
+	// NOTE: Importing all in-tree cloud-providers is not required when
+	// implementing an out-of-tree cloud-provider.
+	_ "k8s.io/legacy-cloud-providers/aws"
+	_ "k8s.io/legacy-cloud-providers/azure"
+	_ "k8s.io/legacy-cloud-providers/gce"
+	_ "k8s.io/legacy-cloud-providers/openstack"
+	_ "k8s.io/legacy-cloud-providers/vsphere"
+)