Bug#1137522: systemd: /etc/systemd/system/autovt@.service symlink not cleaned up on purge

[Raphaël Halimi]

Package: systemd
Version: 261~rc1-1
Affects: piuparts
Dear developer,

When building a package with a simple dependency to `systemd` (one of 
the scripts uses `loginctl`), `piuparts` in Salsa's default CI pipeline 
fails with :

```
0m27.2s INFO: Warning: Package purging left files on system:
  /etc/systemd/system/autovt@.service -> 
/usr/lib/systemd/system/getty@.service	 not owned
0m27.2s ERROR: FAIL: After purging files have been modified:
  /      not owned
0m27.2s ERROR: FAIL: Installation and purging test.
```

(full log: https://salsa.debian.org/MoonSweep/daun/-/jobs/9649333)

Running the pipeline again with SALSA_CI_PIUPARTS_ARGS set to 
"--fake-essential-packages=systemd" succeeds.

(full log: https://salsa.debian.org/MoonSweep/daun/-/jobs/9649826)

Regards,

--
Raphaël Halimi