Capture screenshot and save it in screenshots folder

        :param name: screenshot name suffix
        :returns: screenshot path

def capture_screenshot(self, name):
        """Capture screenshot and save it in screenshots folder

        :param name: screenshot name suffix
        :returns: screenshot path
        """
        filename = '{0:0=2d}_{1}'.format(DriverWrappersPool.screenshots_number, name)
        filename = '{}.png'.format(get_valid_filename(filename))
        filepath = os.path.join(DriverWrappersPool.screenshots_directory, filename)
        if not os.path.exists(DriverWrappersPool.screenshots_directory):
            os.makedirs(DriverWrappersPool.screenshots_directory)
        if self.driver_wrapper.driver.get_screenshot_as_file(filepath):
            self.logger.info('Screenshot saved in %s', filepath)
            DriverWrappersPool.screenshots_number += 1
            return filepath
        return None