This is a mock of what is returned in the rest api, not what is in the cartridge manifest (e.g. https://openshift.redhat.com/broker/rest/application/<appid>/cartridges.json). If we make a change to the format, we need to test the original format (usage_rate_#{curr_code}), the current format (usage rates array), and any new format.

This should probably start with what we expect the API to return for usage rates, and go from there. The API always uses lower-case keys.