Map HTTP request codes in jsonschema

Added schema.py to queues/api/v1/jsonschema. This file maps out the HTTP
request codes in jsonschema to be used by the API.

Partially-Implements: cross-transport-api-spec

Change-Id: I4da61c13a39c0bfe2873f65d14647315494b3554
Merge "Map HTTP request codes in jsonschema"