asyncio SSL hangs if connection is closed before handshake completed

[1st1]

BPO	28990
Nosy	@gvanrossum, @larryhastings, @ned-deily, @1st1

^{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 = 'https://github.com/1st1'
closed_at = <Date 2016-12-17.05:09:15.304>
created_at = <Date 2016-12-16.16:41:05.802>
labels = ['type-bug', '3.7', 'expert-asyncio']
title = 'asyncio SSL hangs if connection is closed before handshake completed'
updated_at = <Date 2016-12-17.05:09:15.303>
user = 'https://github.com/1st1'

bugs.python.org fields:

activity = <Date 2016-12-17.05:09:15.303>
actor = 'ned.deily'
assignee = 'yselivanov'
closed = True
closed_date = <Date 2016-12-17.05:09:15.304>
closer = 'ned.deily'
components = ['asyncio']
creation = <Date 2016-12-16.16:41:05.802>
creator = 'yselivanov'
dependencies = []
files = []
hgrepos = []
issue_num = 28990
keywords = []
message_count = 5.0
messages = ['283414', '283416', '283417', '283465', '283466']
nosy_count = 5.0
nosy_names = ['gvanrossum', 'larry', 'ned.deily', 'python-dev', 'yselivanov']
pr_nums = []
priority = None
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue28990'
versions = ['Python 3.5', 'Python 3.6', 'Python 3.7']

[1st1]

Upstream link: python/asyncio#476

[python-dev]

New changeset fcba55d649ea by Yury Selivanov in branch '3.5':
Issue bpo-28990: Fix SSL hanging if connection is closed before handshake completed.
https://hg.python.org/cpython/rev/fcba55d649ea

New changeset fcc642bf88c1 by Yury Selivanov in branch '3.6':
Merge 3.5 (issue bpo-28990)
https://hg.python.org/cpython/rev/fcc642bf88c1

New changeset 59eea8122df6 by Yury Selivanov in branch 'default':
Merge 3.6 (issue bpo-28990)
https://hg.python.org/cpython/rev/59eea8122df6

[1st1]

Ned, would you be able to cherry-pick this in 3.6.0? Guido approved this.

[python-dev]

New changeset bfd4f13b478b by Yury Selivanov in branch '3.6':
Merge 3.5 (issue bpo-28990)
https://hg.python.org/cpython/rev/bfd4f13b478b

[ned-deily]

[cherrypicked for 3.6.0rc2]