acme: remove crontab entry if service is stopped

Until now it was not possible to stop the acme service, because the handling
was done via cron. With this change, the acme handler can now be stopped by
calling '/etc/init.d/acme' stop. This call removes the entry from the crontab.

Signed-off-by: Florian Eckert <fe@dev.tdt.de>

net/acme-common/files/acme.init

@@ -150,6 +150,14 @@ service_started() {
 	echo "Certificate renewal enabled via cron. To renew now, run '/etc/init.d/acme renew'."
 }
 
+stop_service() {
+	sed -i '\|/etc/init.d/acme|d' /etc/crontabs/root
+}
+
+service_stopped() {
+	echo "Certificate renewal is disabled."
+}
+
 service_triggers() {
 	procd_add_config_trigger config.change acme \
 		/etc/init.d/acme renew