JUnit XML test results can be interpreted by many CI servers, e.g. [circleci](https://circleci.com/docs/2.0/collect-test-data/). So it might be useful to add a utest JUnit XML reporter. reference: [JUnit XSD](https://github.com/windyroad/JUnit-Schema/blob/master/JUnit.xsd). Note: I would be willing to do the work required to implement this, but will likely need some direction on where best to add it.
