Since the web view makes a few API requests to load log messages and
other content, we have to allow more requests. Also, it sounds like
users at a university might all appear to be on the same IP address,
so we want to try to account for that.

Not working as expected, so we are going to have to revisit this
feature in the near future.

These environment variables are now required.  Previously, the
corresponding Django settings would default to 'gracedb'.

This will (hopefully) allow us to receive error emails from the
container deployments on AWS.

Add a logging handler for printing to stdout. For container
deployments, we remove all other logging handlers and use this
new 'console' handler only. The incantation for starting
gunicorn with supervisord now sends the access and error logs
to stdout.

Traefik can pass the subject and issuer in a 'cert-infos'
header, so I am adding an authentication backend to use that.