[qa] Nuke obsolete test framework self-tests

These are all but obsolete since the framework's initialize methods are no longer exposed.

I've tried cleaning them up, and it's technically not difficult, but that just leaves one basic node startup as a test - something that is adequately exercised by existing functional tests.

So I'm nuking these. Further framework tests can be added directly as functional tests and later tagged in some way that they can be excluded from CI or otherwise made easy to handle separately.

Closes #215 (closed).