Set logging for source IP addresses

[tmorrell]

I've reconfigured InvenioRDM to accept the proxied IP address https://github.com/inveniosoftware/cookiecutter-invenio-rdm/pull/323/changes, but our logging via nginx and rdm still show cloudflare IP addresses. We should double check the configuratio nand figure out how to get the real source IP address into our logging https://developers.cloudflare.com/fundamentals/reference/http-headers/#x-forwarded-for