Rsync modules

Auxiliary scanner module to list all available rsync modules.

From [http://rsync.samba.org/ftp/rsync/rsync.html](http://rsync.samba.org/ftp/rsync/rsync.html)
> "Finally, you can list all the (listable) modules available from a particular rsync daemon by leaving off the module name:
rsync somehost.mydomain.com::"