Certbot adds a cron to update certs too

[jvolkenant]

Certbot adds a cron at /etc/cron.d/certbot to renew certs.

Should decide if we want to use certbot's implementation on renewal or our own. I haven't dug into management/ssl_certificates.py to see how they differ.

[jvolkenant]

I think it is safe to remove /etc/cron.d/certbot. My cert's renewed today, certbot ran first (midnight) but did not renew any certs (pretty sure due to the fact we use custom path's) and when management/daily_tasks.sh ran it did renew certs. I've removed /etc/cron.d/certbot and will report back next renewal if there are any ill effects.