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.

Non-priority production containers will use the master for
writes and a read-replica database for reads. This commit adds
functionality for getting the replica's information from
environment variables and sets up a database routing scheme.

Thomas Downes authored 6 years ago and Tanner Prestegard committed 6 years ago

ENABLE_SHIBD environment variable is set to "true" (default="false")

As shown here: emfollow/userguide!23

As requested here: emfollow/gwcelery!359

Have seen issues with "column 'filename' cannot be null" warnings
in the logs recently.  Found the issue in the events API, but
it's not obvious why this started now.  Possibly the upgrade to
Django 1.11.18?  Could have been a MariaDB upgrade too, but haven't
checked the logs to see if that happened.