Shift where router global rate limits config is defined.

This is just to standardize where config is stored a bit.
Shift where trusted proxies config is stored.
Pass the X-Api-Umbrella-Request-Id to the backend servers.

Also this is a rename from the X-Api-Umbrella-UID header previously only
used internally.

We're now passing this to the backends mainly for our own testing
purposes right now, but this could also be useful to API backends, so
they can lookup specific requests based on IDs.
Fix syntax error.