The convention to use is to define `_get_$parser_file_list()` methods
        within Preppers, e.g. `_get_hostname_file_list()` would be used to
        provide filenames for the hostname parser. If such a method is not
        defined within a Prepper for a given parser, we handle that here so
        that individual Preppers do not need to.

        :param parser: The _name_ of the parser to get a file list for
        :type parser:  ``str``

        :param archive: The archive we are operating on currently for the
                        specified parser
        :type archive:  ``SoSObfuscationArchive``

        :returns: A list of filenames within the archive to prep with
        :rtype: ``list``
        Z