because we call `app.Setup` now, and it creates a configz, we need to clean up this config for next test case, or just log the error and don't return directly    ```  \tif cz, err := configz.New("componentconfig"); err == nil {  \t\tcz.Set(cc.ComponentConfig)  \t} else {  \t\treturn nil, nil, fmt.Errorf("unable to register configz: %s", err)  \t}  ```