[issue18623] Factor out the _SuppressCoreFiles context manager

[Antoine Pitrou]

Antoine Pitrou added the comment:

> Is there anything else that this patch should address?

I hoped Charles-François would answer this one, but no, I don't think there's anything left :)
Next step (for another issue perhaps) is to actually re-use this context manager in the other tests which deliberately crash the interpreter.

----------
stage: needs patch -> commit review

_______________________________________
Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18623>
_______________________________________