Removed the event loop policy stubs

We could've just referenced the actual classes instead from the
beginning. D'oh!

asphalt/core/runner.py

@@ -18,21 +18,6 @@
 policies = PluginContainer('asphalt.core.event_loop_policies')
 
 
-def uvloop_policy():
-    import uvloop
-    return uvloop.EventLoopPolicy()
-
-
-def gevent_policy():
-    import aiogevent
-    return aiogevent.EventLoopPolicy()
-
-
-def tokio_policy():
-    import tokio
-    return tokio.TokioLoopPolicy()
-
-
 def sigterm_handler(logger: Logger, event_loop: AbstractEventLoop) -> None:
     if event_loop.is_running():
         logger.info('Received SIGTERM')

setup.cfg

@@ -47,9 +47,9 @@ doc =
 console_scripts =
     asphalt = asphalt.core.cli:main
 asphalt.core.event_loop_policies =
-    uvloop = asphalt.core.runner:uvloop_policy [uvloop]
-    gevent = asphalt.core.runner:gevent_policy [gevent]
-    tokio = asphalt.core.runner:tokio_policy [tokio]
+    uvloop = uvloop:EventLoopPolicy [uvloop]
+    gevent = aiogevent:EventLoopPolicy [gevent]
+    tokio = tokio:TokioLoopPolicy [tokio]
 
 [build_sphinx]
 source-dir = docs