code: def _get_heron_support_processes(self):
      
      retval = {}
  
      retval[self.heron_shell_ids[self.shard]] = Command([
          '%s' % self.heron_shell_binary,
          '--port=%s' % self.shell_port,
          '--log_file_prefix=%s/heron-shell-%s.log' % (self.log_dir, self.shard),
          '--secret=%s' % self.topology_id], self.shell_env)
  
      return retval
docs: Get a map from all daemon services' name to the command to start them