qa: Fix "RuntimeError: Event loop is closed" on Windows

Author: hebasto

test/functional/test_framework/p2p.py

@@ -577,6 +577,8 @@ def __init__(self):
 
         NetworkThread.listeners = {}
         NetworkThread.protos = {}
+        if sys.platform == 'win32':
+            asyncio.set_event_loop_policy(asyncio.WindowsSelectorEventLoopPolicy())
         NetworkThread.network_event_loop = asyncio.new_event_loop()
 
     def run(self):