Switch to using http-socket
Switch to using http-socket

See docs at https://uwsgi-docs.readthedocs.io/en/latest/HTTP.html

This paves the way for us to drop the nginx sidecar and instead directly
use nginx-ingress as the web-facing server.

Ideas for many configurations configurations come from
https://github.com/nginxinc/kubernetes-ingress/issues/143#issuecomment-347814243

lsst-sqre/ltd-keeper,lsst-sqre/ltd-keeper