code: @Override
      public ListPortfoliosResult listPortfolios(ListPortfoliosRequest request) {
          request = beforeClientExecution(request);
          return executeListPortfolios(request);
      }
docs: <p>
  Lists all portfolios in the catalog.
  </p>
  
  @param listPortfoliosRequest
  @return Result of the ListPortfolios operation returned by the service.
  @throws InvalidParametersException
  One or more parameters provided to the operation are not valid.
  @sample AWSServiceCatalog.ListPortfolios
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/servicecatalog-2015-12-10/ListPortfolios" target="_top">AWS
  API Documentation</a>