Allow for generic dynamic tag for testing frameworks to fill in data

Allows for user to define a name and API endpoints for a dynamic tag that can be populated arbitrarily with test results for a request. Also allows for API endpoints so that the tag can link to a detailed results page of the tests.
Both. It's very easy to reconstruct the call. If that 404s, it's only doing a simple find/replace to replicate outside pushmanager. testtag should also log if the urlopen throws an exception.