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/request.py

@@ -95,11 +95,11 @@ class Request(dict):
         "version",
     )
 
-    def __init__(self, url_bytes, headers, version, method, transport):
+    def __init__(self, url_bytes, headers, version, method, transport, app):
         self.raw_url = url_bytes
         # TODO: Content-Encoding detection
         self._parsed_url = parse_url(url_bytes)
-        self.app = None
+        self.app = app
 
         self.headers = headers
         self.version = version