Check product in hasAvailable

[dlongley]

The hasAvailable API should optionally accept a product identifier that can be checked against the given meter. If the product does not match, then the hasAvailable boolean should be false. Additionally the meter information should include the product, which is presently omitted (though returned by the get usage endpoint from the meter service, so it should be present, it just needs to be added to the return value).

https://github.com/digitalbazaar/bedrock-meter-usage-reporter/blob/v9.0.1/lib/meters.js#L229