Remove disabled mark from config file for given app or plugin.
function (apporplugin) {
    try {
      configHelpers.enable(apporplugin);
      logger.info(apporplugin + ' enabled');
    } catch (err) {
      logger.error(
        'Cannot enable given app or plugin, ' +
        apporplugin +
        ' cannot find it in the config file.');
    }
  }