Run tornado gen.coroutines in the context of a task.#2716

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BrandonTheBuilder wants to merge 6 commits intotornadoweb:masterfrom

BrandonTheBuilder:asyncio-runner

Commits on Aug 3, 2019

Add test to assert coroutines run in the context of a task.
Loren Arthur
committed
Update Runner to run coroutine in the context of a task.
Loren Arthur
committed
Add ExpectLog to infinite_coro test.
Loren Arthur
committed
Add callbacks to correctly cancel task.
Loren Arthur
committed
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BrandonTheBuilder
authored and
Loren Arthur
committed
Update type annotations.
Loren Arthur
committed