Writes a collection of path info records for specified clients.

def MultiWritePathInfos(self, path_infos):
    """Writes a collection of path info records for specified clients."""
    try:
      self._MultiWritePathInfos(path_infos)
    except MySQLdb.IntegrityError as error:
      client_ids = list(iterkeys(path_infos))
      raise db.AtLeastOneUnknownClientError(client_ids=client_ids, cause=error)