asyncio shield: remove inner callback on outer cancellation

BPO	35125
Nosy	@asvetlov, @1st1, @miss-islington, @MainRo
PRs	bpo-35125: remove inner callback on outer cancellation in asyncio shield #10340 [3.7] bpo-35125: remove inner callback on outer cancellation in asyncio shield (GH-10340) #13167
Files	shield_cancel.patch: shield cancellation patch

^{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 2019-05-07.19:05:59.639>
created_at = <Date 2018-10-31.15:18:41.298>
labels = ['3.8', 'type-bug', '3.7', 'expert-asyncio']
title = 'asyncio shield: remove inner callback on outer cancellation'
updated_at = <Date 2019-05-07.19:38:02.985>
user = 'https://github.com/mainro'

bugs.python.org fields:

activity = <Date 2019-05-07.19:38:02.985>
actor = 'miss-islington'
assignee = 'none'
closed = True
closed_date = <Date 2019-05-07.19:05:59.639>
closer = 'asvetlov'
components = ['asyncio']
creation = <Date 2018-10-31.15:18:41.298>
creator = 'mainro'
dependencies = []
files = ['47897']
hgrepos = []
issue_num = 35125
keywords = ['patch']
message_count = 3.0
messages = ['328997', '341798', '341807']
nosy_count = 4.0
nosy_names = ['asvetlov', 'yselivanov', 'miss-islington', 'mainro']
pr_nums = ['10340', '13167']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue35125'
versions = ['Python 3.7', 'Python 3.8']