runtests.py: display a message to mention if tests are run in debug or release mode
runtests.py: display a message to mention if tests are run in debug or release mode

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