services: rsync: Allow configuring several rsync "modules".

Until now the rsync service would export a single module, named
"files".  This allows users to specify as many modules as they want, in
line with rsyncd.conf(5).

* gnu/services/rsync.scm (warn-share-field-deprecation): New procedure.
(<rsync-configuration>)[modules]: New field.
[share-path, share-comment, read-only?, timeout]: Mark as deprecated.
(<rsync-module>): New record type.
(%default-modules): New variable.
(rsync-configuration-modules): New procedure.
(rsync-activation): Create the directory of each module.
(rsync-config-file): Generate configuration for each module.
(rsync-service-type)[description]: New field.
* doc/guix.texi (Networking Services): Adjust documentation.  Augment
example.

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