asyncio: Make pause/resume_reading idepotent and no-op for closed transports

BPO	29745
Nosy	@asvetlov, @1st1, @fafhrd91, @iritkatriel
PRs	Make pause/resume_reading idepotent and no-op for closed transports #528
Superseder	bpo-32356: asyncio: Make transport.pause_reading()/resume_reading() idempotent; add transport.is_reading()

^{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 2020-10-21.15:23:52.509>
created_at = <Date 2017-03-07.00:24:13.182>
labels = ['type-bug', '3.7', 'expert-asyncio']
title = 'asyncio: Make pause/resume_reading idepotent and no-op for closed transports'
updated_at = <Date 2020-10-21.15:23:52.508>
user = 'https://github.com/fafhrd91'

bugs.python.org fields:

activity = <Date 2020-10-21.15:23:52.508>
actor = 'iritkatriel'
assignee = 'none'
closed = True
closed_date = <Date 2020-10-21.15:23:52.509>
closer = 'iritkatriel'
components = ['asyncio']
creation = <Date 2017-03-07.00:24:13.182>
creator = 'fafhrd91'
dependencies = []
files = []
hgrepos = []
issue_num = 29745
keywords = []
message_count = 2.0
messages = ['289147', '377279']
nosy_count = 4.0
nosy_names = ['asvetlov', 'yselivanov', 'fafhrd91', 'iritkatriel']
pr_nums = ['528']
priority = 'normal'
resolution = 'out of date'
stage = 'resolved'
status = 'closed'
superseder = '32356'
type = 'behavior'
url = 'https://bugs.python.org/issue29745'
versions = ['Python 3.5', 'Python 3.6', 'Python 3.7']