fixed unit test

sanic/server.py

@@ -549,8 +549,6 @@ def serve(host, port, request_handler, error_handler, before_start=None,
     """
     if not run_async:
         # create new event_loop after fork
-        asyncio.get_event_loop().close()
-
         loop = asyncio.new_event_loop()
         asyncio.set_event_loop(loop)
 

tests/test_multiprocessing.py

@@ -23,4 +23,3 @@ def test_multiprocessing():
     app.run(HOST, app.test_port, workers=num_workers)
 
     assert len(process_list) == num_workers
-