Message 198076 - Python tracker

Having TestLoader.loadTestsFromTestCase() return a "lazy suite" that defers testcase instantiation until iteration is a nice idea.

Unfortunately the TestSuite.addTests api iterates over a suite to add new tests. i.e. the code that builds a TestSuite for module probably already iterates over the suites returned by TestLoader.loadTestsFromTestCase - so the change would need to be more pervasive.