* gnu/services/certbot.scm (certbot-renewal-one-shot): New procedure.
(certbot-service-type)[extensions]: Add it to shepherd-root extension.
(certbot-command): Make connection errors return a different exit code.
(certbot-activation): Remove message with certificate renewal instructions.
Change-Id: I614ac6214a753dba0396e2385a75926c8355caa1
Signed-off-by: Clément Lassieur <clement@lassieur.org>