Use x-real-ip instead of x-forwarded-for in strfry

[dcadenas]

We are having a strfry warning related to x-forwarded-for. According to this strfry comment, we should instead use x-real-ip.

Let's think about how to pass this from Traefik, my understanding is that traefik automaticall passes x-forwarded-for but my initial searches didn't give a good response about x-real-ip so we may need to work on a custom traefik middleware to parse the items in the x-forwarded-for