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