check for already set asyncio event loop policy (#1637)
check for already set asyncio event loop policy (#1637)

* check for already set asyncio event loop policy

* fix linting warning

channelcat/sanic,yunstanford/sanic,ashleysommer/sanic,yunstanford/sanic,ashleysommer/sanic,yunstanford/sanic,channelcat/sanic,channelcat/sanic,ashleysommer/sanic,yunstanford/sanic,channelcat/sanic