asyncio.subprocess's communicate(None) does not close stdin

[marmarek]

BPO	39744
Nosy	@asvetlov, @1st1, @marmarek
PRs	gh-83925: make asyncio.subprocess communicate similar to non-asyncio #18650
Files	commmunicate-test.py: Test script

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2020-02-24.22:09:41.104>
labels = ['3.7', '3.8', '3.9', 'expert-asyncio']
title = "asyncio.subprocess's communicate(None) does not close stdin"
updated_at = <Date 2020-02-24.22:35:32.276>
user = 'https://github.com/marmarek'

bugs.python.org fields:

activity = <Date 2020-02-24.22:35:32.276>
actor = 'marmarek'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['asyncio']
creation = <Date 2020-02-24.22:09:41.104>
creator = 'marmarek'
dependencies = []
files = ['48910']
hgrepos = []
issue_num = 39744
keywords = ['patch']
message_count = 2.0
messages = ['362605', '362606']
nosy_count = 3.0
nosy_names = ['asvetlov', 'yselivanov', 'marmarek']
pr_nums = ['18650']
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = None
url = 'https://bugs.python.org/issue39744'
versions = ['Python 3.7', 'Python 3.8', 'Python 3.9']

[marmarek]

Standard subprocess's communicate() called with None input (or no argument at all closes process stdin. The asyncio variant does not.
This leads to issue with various processes that wait for EOF on stdin before terminating.

Test script attached.

[marmarek]

This is BTW similar to https://bugs.python.org/issue26848