code: def find_clients(self, hosts):
      
      # TODO(tomchop): Thread this
      clients = []
      for host in hosts:
        clients.append(self._get_client_by_hostname(host))
      return [client for client in clients if client is not None]
docs: Finds GRR clients given a list of hosts.
  
      Args:
        hosts: List of hostname FQDNs
  
      Returns:
        List of GRR client objects.