[issue20648] 3.4 cherry-pick: multiple changesets for asyncio

[STINNER Victor]

STINNER Victor added the comment:

changeset:   89300:c3abdf016b18
tag:         tip
user:        Victor Stinner <victor.stinner at gmail.com>
date:        Thu Feb 20 10:12:59 2014 +0100
files:       Lib/asyncio/subprocess.py
description:
asyncio.subprocess: Fix a race condition in communicate()

Use self._loop instead of self._transport._loop, because transport._loop is set
to None at process exit.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue20648>
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