This example was confusing at first because the element the message
indicated wasn't in the list of possible values was but the possible
values didn't match up either. This ensures the example is consistent
with the logic being presented.
This adds a simple configuration for sending snapshots to a remote
system using zfs-replicate that ties into the autoSnapshot settings
already present in services.zfs.autoSnapshot.
Without fcrontab being setuid, every attempt by an user in the fcron
group to edit their own crontab (via `fcrontab -e`) results in the
following error:
```
2018-05-06 11:29:07 ERROR could not change euid to 273: Operation not permitted
2018-05-06 11:29:07 ERROR fcron child aborted: this does not affect the main fcron daemon, but this may prevent a job from being run or an email from being sent.
```
Adding setuid by hand has resolved this issue and aligns with the way
fcrontab is installed on other distributions.
Alex Brandt