[issue23347] asyncio: fix and refactor creation of subprocess transports

[Roundup Robot]

Roundup Robot added the comment:

New changeset dadc372f46fa by Victor Stinner in branch '3.4':
Issue #23347, asyncio: Make BaseSubprocessTransport.wait() private
https://hg.python.org/cpython/rev/dadc372f46fa

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue23347>
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