fix tests

weed/shell/command_volume_server_evacuate_test.go

@@ -10,7 +10,8 @@ func TestVolumeServerEvacuate(t *testing.T) {
 
 	volumeServer := "192.168.1.4:8080"
 
-	if err := evacuateNormalVolumes(nil, topologyInfo, volumeServer, true, false, os.Stdout); err != nil {
+	c := commandVolumeServerEvacuate{}
+	if err := c.evacuateNormalVolumes(nil, topologyInfo, volumeServer, true, false, os.Stdout); err != nil {
 		t.Errorf("evacuate: %v", err)
 	}