Avoid circular references in asyncio streams

[asvetlov]

BPO	34638
Nosy	@asvetlov, @1st1
PRs	bpo-34638: Store a weak reference to stream reader to break strong references loop #9201

^{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 = <Date 2018-09-12.18:43:38.924>
created_at = <Date 2018-09-11.23:47:26.205>
labels = ['3.8', 'expert-asyncio']
title = 'Avoid circular references in asyncio streams'
updated_at = <Date 2018-09-12.18:43:38.923>
user = 'https://github.com/asvetlov'

bugs.python.org fields:

activity = <Date 2018-09-12.18:43:38.923>
actor = 'asvetlov'
assignee = 'none'
closed = True
closed_date = <Date 2018-09-12.18:43:38.924>
closer = 'asvetlov'
components = ['asyncio']
creation = <Date 2018-09-11.23:47:26.205>
creator = 'asvetlov'
dependencies = []
files = []
hgrepos = []
issue_num = 34638
keywords = ['patch']
message_count = 2.0
messages = ['325095', '325164']
nosy_count = 2.0
nosy_names = ['asvetlov', 'yselivanov']
pr_nums = ['9201']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue34638'
versions = ['Python 3.8']

[asvetlov]

Now we have a cross-reference between asyncio stream reader and protocol.

It prevents objects deletion on ref-counting and requires a garbage collector run to destroy the stream.

[asvetlov]

New changeset a5d1eb8 by Andrew Svetlov in branch 'master':
bpo-34638: Store a weak reference to stream reader to break strong references loop (GH-9201)
a5d1eb8