delete some para no need used in local volume

pkg/volume/local/local.go

@@ -573,7 +573,7 @@ type localVolumeUnmapper struct {
 var _ volume.BlockVolumeUnmapper = &localVolumeUnmapper{}
 
 // TearDownDevice will undo SetUpDevice procedure. In local PV, all of this already handled by operation_generator.
-func (u *localVolumeUnmapper) TearDownDevice(mapPath, devicePath string) error {
+func (u *localVolumeUnmapper) TearDownDevice(mapPath, _ string) error {
 	glog.V(4).Infof("local: TearDownDevice completed for: %s", mapPath)
 	return nil
 }

pkg/volume/local/local_test.go

@@ -41,7 +41,6 @@ const (
 	testMountPath                     = "pods/poduid/volumes/kubernetes.io~local-volume/pvA"
 	testGlobalPath                    = "plugins/kubernetes.io~local-volume/volumeDevices/pvA"
 	testPodPath                       = "pods/poduid/volumeDevices/kubernetes.io~local-volume"
-	testNodeName                      = "fakeNodeName"
 	testBlockFormattingToFSGlobalPath = "plugins/kubernetes.io/local-volume/mounts/pvA"
 )