asyncio: Make transport.pause_reading()/resume_reading() idempotent; add transport.is_reading()

[1st1]

BPO	32356
Nosy	@vstinner, @asvetlov, @1st1
PRs	bpo-32356: idempotent pause_/resume_reading; new is_reading method. #4914 [3.6] bpo-32356: idempotent pause_/resume_reading (GH-4914) #7629

^{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 2017-12-18.22:03:50.479>
created_at = <Date 2017-12-18.03:46:15.855>
labels = []
title = 'asyncio: Make transport.pause_reading()/resume_reading() idempotent; add transport.is_reading()'
updated_at = <Date 2018-06-13.10:05:18.494>
user = 'https://github.com/1st1'

bugs.python.org fields:

activity = <Date 2018-06-13.10:05:18.494>
actor = 'vstinner'
assignee = 'none'
closed = True
closed_date = <Date 2017-12-18.22:03:50.479>
closer = 'yselivanov'
components = []
creation = <Date 2017-12-18.03:46:15.855>
creator = 'yselivanov'
dependencies = []
files = []
hgrepos = []
issue_num = 32356
keywords = ['patch']
message_count = 3.0
messages = ['308509', '308587', '319444']
nosy_count = 3.0
nosy_names = ['vstinner', 'asvetlov', 'yselivanov']
pr_nums = ['4914', '7629']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue32356'
versions = []

[1st1]

As briefly discussed on python/asyncio#488 and #528

[1st1]

New changeset d757aaf by Yury Selivanov in branch 'master':
bpo-32356: idempotent pause_/resume_reading; new is_reading method. (bpo-4914)
d757aaf

[vstinner]

New changeset 142e3c0 by Victor Stinner in branch '3.6':
[3.6] bpo-32356: idempotent pause_/resume_reading (GH-4914) (GH-7629)
142e3c0