[issue36889] Merge StreamWriter and StreamReader into just asyncio.Stream

[Kubilay Kocak]

Kubilay Kocak <koobs.freebsd at gmail.com> added the comment:

Seeing a test_ayncio failure on koobs-freebsd-current:

Timeout (0:25:00)!
Thread 0x0000000800abb000 (most recent call first):
  File "/usr/home/buildbot/python/3.x.koobs-freebsd-current/build/Lib/selectors.py", line 558 in select
  File "/usr/home/buildbot/python/3.x.koobs-freebsd-current/build/Lib/asyncio/base_events.py", line 1813 in _run_once
  File "/usr/home/buildbot/python/3.x.koobs-freebsd-current/build/Lib/asyncio/base_events.py", line 563 in run_forever
  File "/usr/home/buildbot/python/3.x.koobs-freebsd-current/build/Lib/asyncio/base_events.py", line 595 in run_until_complete
  File "/usr/home/buildbot/python/3.x.koobs-freebsd-current/build/Lib/test/test_asyncio/test_streams.py", line 1531 in test_stream_server_abort

Some errors (warnings?) later in the re-run (which passes), may be related/indicative:

Future exception was never retrieved
future: <Future finished exception=BrokenPipeError()>
Traceback (most recent call last):
  File "/usr/home/buildbot/python/3.x.koobs-freebsd-current/build/Lib/asyncio/subprocess.py", line 173, in _feed_stdin
    await self.stdin.drain()
  File "/usr/home/buildbot/python/3.x.koobs-freebsd-current/build/Lib/asyncio/streams.py", line 1415, in drain
    await self._protocol._drain_helper()
  File "/usr/home/buildbot/python/3.x.koobs-freebsd-current/build/Lib/asyncio/streams.py", line 594, in _drain_helper
    await waiter
BrokenPipeError

Full log attached

----------
nosy: +koobs
resolution: fixed -> 
status: closed -> open
Added file: https://bugs.python.org/file48376/koobs-freebsd-current-3.x-build-168.stdio.txt

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<https://bugs.python.org/issue36889>
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