The version of Salt we're running doesn't do a good job of detecting
systemd.  Inspired by https://github.com/saltstack/salt/issues/13926,
I added a provider-force to the services.

With this change, salt-call -l debug state.highstate succeeds, even for
repeated invocations.

The issue was (probably) benign, but definitely caused noised (e.g. #11297)