code: def list_directory(self, mdir, limit=None, marker=None):
          
          res, dirents = self.list_directory2(mdir, limit=limit, marker=marker)
          return dirents
docs: ListDirectory
          https://apidocs.joyent.com/manta/api.html#ListDirectory
  
          @param mdir {str} A manta path, e.g. '/trent/stor/mydir'.
          @param limit {int} Limits the number of records to come back (default
              and max is 1000).
          @param marker {str} Key name at which to start the next listing.
          @returns Directory entries (dirents). E.g.:
              [{u'mtime': u'2012-12-11T01:54:07Z', u'name': u'play', u'type': u'directory'},
               ...]