function (callback) {
    var plugins = Object.keys(pluginHelpers.loadedPlugins || {});
    async.eachSeries(plugins, pluginHelpers.stop, callback);
  }
function (callback) {
    var plugins = Object.keys(pluginHelpers.loadedPlugins || {});
    async.eachSeries(plugins, pluginHelpers.stop, callback);
  }
function ( callback ) { var plugins = Object . keys ( pluginHelpers . loadedPlugins || { } ) ; async . eachSeries ( plugins , pluginHelpers . stop , callback ) ; }
Stop all plugins.

@param callback Termination.
Stop all plugins .