Patch by Martin Panter, reviewed by Serhiy Storchaka and R. David Murray.

Test that asyncio.iscoroutine() supports 'async def' coroutines and
collections.abc.Coroutine types.

Patch by Vinod Kurup.

Patch by Vinod Kurup.

Initial patch by Vajrasky Kok.

(Contributed by Serhiy Storchaka.)

(Patch by Berker Peksag.)

No more test_main(), s/assertEquals/assertEqual/, and remove unused import.

* adds missing INCREF in WITH_CLEANUP_START
* adds missing DECREF in WITH_CLEANUP_FINISH
* adds several new tests Yury created while investigating this

Comparing equality of list and tuple is always False.