Latest version of the docker snap fails to install on Fedora with the
following message:

```
 error: cannot install "docker": snap "docker" assumes unsupported features:
       snapd2.59.1 (try to refresh snapd)
```

Trying to refresh snapd doesn't actually solve the issue. While we
investigage, installing from the older stable channel should keep the
spread tests running.

Also do some minor cleanup from the fedora 36 -> 37 update.