Fix runtests.py --forever for python 3.4. Thanks to Antoine Pitrou.
Fix runtests.py --forever for python 3.4.
Thanks to Antoine Pitrou.

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