Setup reverse proxy configuration

[waynedyck]

Now that we are passing the X-Forwarded-For header we should configure Drupal so it sees the actual client IP address rather than our own. The Using a load balancer or reverse proxy article is a good reference on how to do this.

The configuration required to enable this environment consists of:

• Setting the configuration value reverse_proxy to TRUE,
• Setting the configuration value reverse_proxy_addresses to an array containing the IP of HTTP Reverse Proxy, as seen from the web servers.

[waynedyck]

Closing this for now. If we decided it's worth implementing I will re-open the issue.