Code review comment for autopkgtest-cloud:more-fail-strings

I ran autopkgtest for the version of systemd with the qemu backend:

autopkgtest --apt-upgrade systemd --add-apt-source="deb https://ppa.launchpadcontent.net/enr0n/systemd-broken/ubuntu kinetic main" --add-apt-source="deb-src https://ppa.launchpadcontent.net/enr0n/systemd-broken/ubuntu kinetic main" -o /tmp/systemd-broken -- qemu --ram-size=
4096 --cpus=4 /srv/vms/autopkgtest-kinetic-amd64.img

and the log file does not contain any lines regarding failure to resolve:

autopkgtest [10:17:56]: rebooting testbed after setup commands that affected boot
autopkgtest [10:18:11]: testbed running kernel: Linux 5.15.0-27-generic #28-Ubuntu SMP Thu Apr 14 04:55:28 UTC 2022
autopkgtest [10:18:12]: testbed dpkg architecture: amd64
autopkgtest [10:18:14]: @@@@@@@@@@@@@@@@@@@@ apt-source systemd
qemu-system-x86_64: terminating on signal 15 from pid 983677 (/usr/bin/python3)
autopkgtest [10:21:21]: ERROR: testbed failure: rules extract failed with exit code 100 (apt failure)

Perhaps autopkgtest is not logging as much it did in the past or the --debug switch was being used?