Simplify test_events.py, don't use non local variables and don't call assert methods in coroutines.
Simplify test_events.py, don't use non local variables and don't call assert
methods in coroutines.

It also simplify merges from Tulip to Trollius (Python 2 does not support non
local variables).

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