Comment 2 for bug 2064582

it seems that for some reason autopkgtest does inherit the signal from the kill command, and from systemctl restart:
```
May 02 16:13:52 juju-113c58-stg-proposed-migration-environment-35 /home/ubuntu/autopkgtest-cloud/worker/worker[2078485]: INFO: Caught SIGTERM, requesting exit
May 02 16:13:53 juju-113c58-stg-proposed-migration-environment-35 /home/ubuntu/autopkgtest-cloud/worker/worker[2078485]: WARNING: autopkgtest exited with code: -15
                                                                                                                         ack-ing message: b'autopkgtest\n{"triggers": ["autopkgtest/5.34ubuntu2"], "submit-time": "2024-05-02 16:12:58", "uuid": "5db3f9be-26f8-42a8-ae2b-2d3ec70cdfd9"}'

```