def load_additional(from)
      from = [ Ohai.config[:plugin_path], from].flatten
      plugin_files_by_dir(from).collect do |plugin_file|
        logger.trace "Loading additional plugin: #{plugin_file}"
        plugin = load_plugin_class(plugin_file)
        load_v7_plugin(plugin)
      end
    end
def load_additional(from)
      from = [ Ohai.config[:plugin_path], from].flatten
      plugin_files_by_dir(from).collect do |plugin_file|
        logger.trace "Loading additional plugin: #{plugin_file}"
        plugin = load_plugin_class(plugin_file)
        load_v7_plugin(plugin)
      end
    end
load additional plugins classes from a given directory
 @param from [String] path to a directory with additional plugins to load