it's no longer pulled in by cloud-init (since 2014...). None
of these kickstarts has it in %packages, and it's not in any
of the cloud environment or package groups in comps either. So
it seems like no-one particularly wants rsyslog in the cloud
images.

From compose logs, it looks like trying to enable a non-existent
service in anaconda in Fedora 24 and earlier wasn't a fatal
error (anaconda more or less logged a warning and continued),
but in Fedora 25 and later it does seem to be fatal. It at least
causes one anaconda thread to crash, though the image compose
completes. I think possibly at least the way anaconda's run
in the Cloud compose process, the main thread manages to exit,
but it seems pretty likely the thread crash will result in
problems in the produced image.

Needed on master and f25.