Detect core dumps after BIND failed to stop cleanly
With the pytest runner, when BIND crashed during test runtime, the
get_core_dumps.sh
script hasn't been run, and core dumps were not
detected.
Before: https://gitlab.isc.org/isc-projects/bind9/-/pipelines/142423
After: https://gitlab.isc.org/isc-projects/bind9/-/pipelines/142420