iotests.py: Enable faulthandler

With this, you can send SIGABRT to a hanging test case and you'll get a
Python stack trace so you know where it was hanging.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: John Snow <jsnow@redhat.com>
Tested-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-id: 20200313083617.8326-2-kwolf@redhat.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
1 file changed