[review request] usr.sbin/service - make showing files configurable

Hi,

I found service(8) to be inconsistent that it listed files with `service
-e`, but plain services with `service -l`

My patch makes the default just list *service names*, and specifying -F
will show the full path to the file.

Patch:

http://www.shatow.net/freebsd/patch-service.txt

Regards,
Bryan Drewery