fix failing tests which happened as we merged multiple PRs at the same time and one PR removed the import (#422)

Author: rahulait

cloud/linode/cloud_test.go

@@ -7,6 +7,7 @@ import (
 
 	"github.com/golang/mock/gomock"
 	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
 	cloudprovider "k8s.io/cloud-provider"
 
 	"github.com/linode/linode-cloud-controller-manager/cloud/linode/client/mocks"