unify our TCK testing setup

[struberg]

This got brought up by @tomas-langer in todays ConfigJSR hangout. Most of our TCKs use testng, but some also use junit. Some use Arquillian, others EE.

This makes it harder than it should to integrate MicroProfile specs within containers. It also makes it harder for new people to contribute to MicroProfile if every subproject has it's own rules.

We should probably spread/force some best efforts and standards?

[kenfinnigan]

What's needed beyond the update to the Architecture guidelines around using TestNG and Arquillian?

Does there need to be an action to actively verify all specs as to what they're using?

[lprimak]

IMHO TestNG's time has run out. JUnit 5 is much more supported and has much more activity around it