Ensure that lower-level rate limit errors are captured in the analytics system

[GUI]

If you bump into the lower-level IP based rate limits enforced by nginx, these over rate limit errors may not show up in the web-based analytics. We need to ensure that even when the request doesn't make it to the gatekeeper, we still log the requests in our analytics system so it shows up in the admin analytics.

See 18F/api.data.gov#77