Fix #1528 (#1549)

* assign app before handle_request so that request.app could be used in case of connection timeout

* gitignore pip-wheel-metadata/

* remove default app for request class and fix lint issue

sanic/app.py

@@ -881,8 +881,6 @@ class Sanic:
             # -------------------------------------------- #
             # Request Middleware
             # -------------------------------------------- #
-
-            request.app = self
             response = await self._run_request_middleware(request)
             # No middleware results
             if not response:
@@ -1288,6 +1286,7 @@ class Sanic:
             "port": port,
             "sock": sock,
             "ssl": ssl,
+            "app": self,
             "signal": Signal(),
             "debug": debug,
             "request_handler": self.handle_request,