Do all async operations in the same task in gunicorn workers

[asvetlov]

Like we do for web.run_app() already.

The reason is: on every loop.run_until_complete() a new contextvars context copy is created (and deleted on task exit).
It leads to the situation when context var changed on app.on_startup() stage is not visible in web-handler etc.

P.S.
The fix worth to be backported to 3.5

[aio-libs-bot]

GitMate.io thinks possibly related issues are #1196 (Additional handler params for gunicorn worker ), #269 (Worker is broken with latest Gunicorn), #458 ([bug] Gunicorn worker logs are incorrect), #2033 (Support application coroutine factory in web.run_app and gunicorn worker.), and #705 (access log format is invalid when using gunicorn worker).

[asvetlov]

Fixed by #3471

[lock]

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