Add response body validation support

In many cases, when we are expecting a response body, we test that certain key-value pairs match expected values. The testing package does not currently support this.

added Enhancement statewip team:webdev labels

assigned to @zacharysabourin

mentioned in commit zacharysabourin/eclipsefdn-api-common@e3ffa823

mentioned in merge request !46 (merged)

mentioned in commit zacharysabourin/eclipsefdn-api-common@f8110803

added statereview label and removed statewip label

closed with merge request !46 (merged)

closed with commit f8110803

reopened

mentioned in merge request !47 (merged)

closed with merge request !47 (merged)