Revert "Remove references to openstack and cinder"

This reverts commit 9bbf01bae9.

test/e2e/framework/providers/openstack/openstack.go

@@ -0,0 +1,34 @@
+/*
+Copyright 2019 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.
+*/
+
+package openstack
+
+import (
+	"k8s.io/kubernetes/test/e2e/framework"
+)
+
+func init() {
+	framework.RegisterProvider("openstack", newProvider)
+}
+
+func newProvider() (framework.ProviderInterface, error) {
+	return &Provider{}, nil
+}
+
+// Provider is a structure to handle OpenStack clouds for e2e testing
+type Provider struct {
+	framework.NullProvider
+}