close daemon connector on server close to avoid errors on tests

torba/torba/server/daemon.py

@@ -57,6 +57,11 @@ class Daemon:
         self.available_rpcs = {}
         self.connector = aiohttp.TCPConnector()
 
+    async def close(self):
+        if self.connector:
+            await self.connector.close()
+            self.connector = None
+
     def set_url(self, url):
         """Set the URLS to the given list, and switch to the first one."""
         urls = url.split(',')

torba/torba/server/server.py

@@ -146,6 +146,7 @@ class Server:
             task.cancel()
         await asyncio.wait(self.cancellable_tasks)
         self.shutdown_event.set()
+        await self.daemon.close()
 
     def run(self):
         loop = asyncio.get_event_loop()