Fix for image servcie v2 client

Change-Id: I5bcd606559bec6c4ccafa9f7e043ed7cbea03665
diff --git a/openstack/client.go b/openstack/client.go
index cf45329..f9c7357 100644
--- a/openstack/client.go
+++ b/openstack/client.go
@@ -340,5 +340,5 @@
 	if err != nil {
 		return nil, err
 	}
-	return &gophercloud.ServiceClient{ProviderClient: client, Endpoint: url}, nil
+	return &gophercloud.ServiceClient{ProviderClient: client, Endpoint: url, ResourceBase: url + "v2.0/"}, nil
 }