Signal handling doesn't work in interactive Python session

Currently, to use the scarab-based signal handling you have to create a signal_handler and add the appropriate cancelable. This is fine for executables, e.g. dl-serve. However, it's not workable for an interactive session.

I created a script that uses `core.Interface` to e.g. `get peaches` from the KVS. For network reasons it wasn't able to contact the broker, so it tried multiple times using exponential backoff. I attempted to cancel that with ctrl-c, but it didn't work because the signal hadn't been setup to be caught. I got it to stop by repeating ctrl-c twice, resulting in an unhandled exception and a long traceback.

I'm not sure what the right way to handle this is, at the moment.

Commencez par core.Interface et comparez son signal_handler et sa configuration cancelable avec le chemin de l’exécutable dl-serve. Reproduisez le scénario de nouvelle tentative du broker dans une session Python interactive et vérifiez que Ctrl-C annule proprement l’opération sans exception non gérée ni long traceback ; l’issue ne nomme aucun fichier ni test.

Rédigé par le modèle d'indexation à partir du texte de l'issue.