Change kill SIGINT test to use SIGSTOP
Change kill SIGINT test to use SIGSTOP

I think the original intention of the original test was the check that
different signals work, I think. This does this -- it sends a signal
that doesn't cause the container to stop.

Closes #759. Replaces #1467.

Signed-off-by: Ben Firshman <73675debcd8a436be48ec22211dcf44fe0df0a64@firshman.co.uk>

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