Fix logger after scope removal

[euri10]

This PR fixes a bug I introduced in #859 that wasn't caught with test.

Since the scope has been removed from the log record, the access log formatter is broken, we cant rely on the scope anymore to build the record

So the PR does 2 things:

1. pass explicitly as extra kwarg of the access logger in httptools and h11 the required scope elements to build subsequent access log records (precisely root_path, path and query_string)
2. derive the log records directly without relying on the scope and remove all unnecessary method that were using scope

see this trace:

INFO:     Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
INFO:     Started reloader process [3287] using watchgod
INFO:     Started server process [3293]
INFO:     Waiting for application startup.
INFO:     ASGI 'lifespan' protocol appears unsupported.
INFO:     Application startup complete.
--- Logging error ---
Traceback (most recent call last):
  File "/home/lotso/.asdf/installs/python/3.8.6/lib/python3.8/logging/__init__.py", line 1081, in emit
    msg = self.format(record)
  File "/home/lotso/.asdf/installs/python/3.8.6/lib/python3.8/logging/__init__.py", line 925, in format
    return fmt.format(record)
  File "/home/lotso/.asdf/installs/python/3.8.6/lib/python3.8/logging/__init__.py", line 667, in format
    s = self.formatMessage(record)
  File "./uvicorn/logging.py", line 111, in formatMessage
    scope = recordcopy.__dict__["scope"]
KeyError: 'scope'
Call stack:
  File "<string>", line 1, in <module>
  File "/home/lotso/.asdf/installs/python/3.8.6/lib/python3.8/multiprocessing/spawn.py", line 116, in spawn_main
    exitcode = _main(fd, parent_sentinel)
  File "/home/lotso/.asdf/installs/python/3.8.6/lib/python3.8/multiprocessing/spawn.py", line 129, in _main
    return self._bootstrap(parent_sentinel)
  File "/home/lotso/.asdf/installs/python/3.8.6/lib/python3.8/multiprocessing/process.py", line 315, in _bootstrap
    self.run()
  File "/home/lotso/.asdf/installs/python/3.8.6/lib/python3.8/multiprocessing/process.py", line 108, in run
    self._target(*self._args, **self._kwargs)
  File "./uvicorn/subprocess.py", line 61, in subprocess_started
    target(sockets=sockets)
  File "./uvicorn/server.py", line 48, in run
    loop.run_until_complete(self.serve(sockets=sockets))
  File "./uvicorn/protocols/http/httptools_impl.py", line 396, in run_asgi
    result = await app(self.scope, self.receive, self.send)
  File "./uvicorn/middleware/proxy_headers.py", line 45, in __call__
    return await self.app(scope, receive, send)
  File "./app.py", line 26, in app
    await send({
  File "./uvicorn/protocols/http/httptools_impl.py", line 458, in send
    self.access_logger.info(
Message: '%s - "%s %s HTTP/%s" %d'
Arguments: ('127.0.0.1:51410', 'GET', '/', '1.1', 200)
--- Logging error ---
Traceback (most recent call last):
  File "/home/lotso/.asdf/installs/python/3.8.6/lib/python3.8/logging/__init__.py", line 1081, in emit
    msg = self.format(record)
  File "/home/lotso/.asdf/installs/python/3.8.6/lib/python3.8/logging/__init__.py", line 925, in format
    return fmt.format(record)
  File "/home/lotso/.asdf/installs/python/3.8.6/lib/python3.8/logging/__init__.py", line 667, in format
    s = self.formatMessage(record)
  File "./uvicorn/logging.py", line 111, in formatMessage
    scope = recordcopy.__dict__["scope"]
KeyError: 'scope'
Call stack:
  File "<string>", line 1, in <module>
  File "/home/lotso/.asdf/installs/python/3.8.6/lib/python3.8/multiprocessing/spawn.py", line 116, in spawn_main
    exitcode = _main(fd, parent_sentinel)
  File "/home/lotso/.asdf/installs/python/3.8.6/lib/python3.8/multiprocessing/spawn.py", line 129, in _main
    return self._bootstrap(parent_sentinel)
  File "/home/lotso/.asdf/installs/python/3.8.6/lib/python3.8/multiprocessing/process.py", line 315, in _bootstrap
    self.run()
  File "/home/lotso/.asdf/installs/python/3.8.6/lib/python3.8/multiprocessing/process.py", line 108, in run
    self._target(*self._args, **self._kwargs)
  File "./uvicorn/subprocess.py", line 61, in subprocess_started
    target(sockets=sockets)
  File "./uvicorn/server.py", line 48, in run
    loop.run_until_complete(self.serve(sockets=sockets))
  File "./uvicorn/protocols/http/httptools_impl.py", line 396, in run_asgi
    result = await app(self.scope, self.receive, self.send)
  File "./uvicorn/middleware/proxy_headers.py", line 45, in __call__
    return await self.app(scope, receive, send)
  File "./app.py", line 26, in app
    await send({
  File "./uvicorn/protocols/http/httptools_impl.py", line 458, in send
    self.access_logger.info(
Message: '%s - "%s %s HTTP/%s" %d'
Arguments: ('127.0.0.1:51410', 'GET', '/favicon.ico', '1.1', 200)

[florimondmanca]

Yup, good catch!