Close response object explicitly in http tests.
Close response object explicitly in http tests.

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