Ignore now-closed connections in pool.
Ignore now-closed connections in pool.

1st1/asyncio,vxgmichel/asyncio,vxgmichel/asyncio,gvanrossum/asyncio,Martiusweb/asyncio,vxgmichel/asyncio,fallen/asyncio,1st1/asyncio,gvanrossum/asyncio,gsb-eng/asyncio,haypo/trollius,1st1/asyncio,manipopopo/asyncio,manipopopo/asyncio,Martiusweb/asyncio,ajdavis/asyncio,jashandeep-sohi/asyncio,ajdavis/asyncio,gsb-eng/asyncio,fallen/asyncio,manipopopo/asyncio,fallen/asyncio,haypo/trollius,jashandeep-sohi/asyncio,gvanrossum/asyncio,Martiusweb/asyncio,jashandeep-sohi/asyncio,ajdavis/asyncio,gsb-eng/asyncio,haypo/trollius