testsuite: Use sigkill in process009.

Andreas Klebingerrequested to merge
wip/andreask/sig-hup into master 
testsuite: Use sigkill in process009.

SIGHUB might have been blocked by a (grand)*parent of the test.
In such cases the test would fail as the python process would simply
exist gracefully instead of committing to a premature end.

By using SIGKILL we can rely on the signal not being blocked, fixing #27578
in the process.

Fixes #27578 (closed)

Edited by Andreas Klebinger

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