* modules/rosenthal/services/file-systems.scm (zfs-configuration): [zfs]
[kernel-has-zfs-module?]: New fields.
(zfs-linux-loadable-module-service, add-zfs-package): New procedures.
(zfs-service-type): Use them.
* modules/rosenthal/services/file-systems.scm (<zfs-configuration>): New data
type.
Enable auto mounting and disable volumes by default.
(zfs-shepherd-service): Rename to zfs-shepherd.
No longer use one-shot services.
(zfs-service-type): Adjust accordingly.
Set default value.
* modules/rosenthal/utils/transformations.scm (rosenthal-transformation-zfs):
Allow configuration.
