lib/plugins.js
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.