Allow out of quota failure status code to be 413 or 403

This commit I7c179748769b8a0e2cc2e476ebefe33449f6f304 changes the
error code for when a request fails due to quota exhaustion from 413
to 403. The corresponding tempest tests now allow both 413 and 403 as
an acceptable error code to fit into the new branchless tempest model.

Change-Id: Ia7906d9036d760fc51cd36639bde721e5782a36d
Related-bug: #1334903
Merge "Allow out of quota failure status code to be 413 or 403"