Final warnings removals for api-ref

This removes the final warnings from the api-ref code base, and flips
the sphinx switch to enforce warnings as errors.

It also adds code to the rest_parameters extension to make it more
clear where a problem is when it comes to included parameters. This
puts us in a place where we can start doing the file per file look at
content.

Part of bp:api-ref-in-rst

Change-Id: Ic2c99d96d6addcafa00b9f16785c2fe59b1798d3

api-ref/source/servers-multiple-create.inc

@@ -36,7 +36,7 @@ Request
   - imageRef: imageRef
   - flavorRef: flavorRef
   - networks: networks
-  - uuid: uuid
+  - uuid: network_uuid
   - port: port
   - fixed_ip: fixed_ip
   - name: name
@@ -104,7 +104,7 @@ Request
   - imageRef: imageRef
   - flavorRef: flavorRef
   - networks: networks
-  - uuid: uuid
+  - uuid: network_uuid
   - port: port
   - fixed_ip: fixed_ip
   - name: name