stop --follow'ing output when simulation ends

Currently sim show-output --follow must be manually aborted when the simulation ends. This is inconvenient (at least) for the tutorial server notebook https://nbviewer.jupyter.org/github/nds-org/jupyter-et/blob/master/CactusTutorial.ipynb where the TOV evolution uses submit (to show how this would be done on a real cluster) then show-output --follow (to show what is going on) and requires users to press the “interrupt” button to continue in the notebook.

Pull request:

https://bitbucket.org/simfactory/simfactory2/pull-requests/39/end-following-output-when-simulation-ends/diff

adds code to simfactory’s show-output routine to kill -TERM the tail process running to show output when the simulation is detected to have ended (polled every 60 seconds).

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