aiohttp==2.2.0 Unclosed client session warning

[Rybak5611]

Long story short

After fixing #1981 there is now new bug, causing Unclosed client session warnings when repeating requests.

Expected behaviour

No warnings.

Actual behaviour

Warnings.

Steps to reproduce

import aiohttp
import asyncio

async def Init():

	for N in range( 5 ): # Key difference from #1981 test, warnings only happen when repeating the request

		Response = await aiohttp.request( "GET", "http://www.google.com/" )

		async for Line in Response.content:
			print( "Received {} bytes".format( len( Line ) ) )


if __name__ == "__main__":

	Loop = asyncio.get_event_loop()
	Loop.run_until_complete( Init() )

Your environment

Tested on Windows 10 build 15063, Debian 8
Python 3.6, aiohttp==2.2.0

Traceback ( aiohttp 2.2.0 )

PS C:\Users\root\Desktop> pip install aiohttp==2.2.0 -q
PS C:\Users\root\Desktop> .\test.py
Unclosed client session
client_session: <aiohttp.client.ClientSession object at 0x040C79D0>
Received 3362 bytes
Received 1580 bytes
Received 85 bytes
Received 2 bytes
Received 6281 bytes
Received 29 bytes
Unclosed client session
client_session: <aiohttp.client.ClientSession object at 0x0376CD90>
Received 3273 bytes
Received 1580 bytes
Received 85 bytes
Received 2 bytes
Received 6281 bytes
Received 29 bytes
Received 3363 bytes
Received 1580 bytes
Received 85 bytes
Received 2 bytes
Unclosed client session
client_session: <aiohttp.client.ClientSession object at 0x0376CCB0>
Received 6279 bytes
Received 29 bytes
Unclosed client session
client_session: <aiohttp.client.ClientSession object at 0x040D7E30>

[Rybak5611]

Duplicate of #2036

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