IDLE: add 'async' to codecontext block openers

[terryjreedy]

BPO	33564
Nosy	@terryjreedy, @miss-islington
PRs	bpo-33564: Add async to IDLE's code context block openers. #6960 [3.7] bpo-33564: Add async to IDLE's code context block openers. (GH-6960) #6961 [3.6] bpo-33564: Add async to IDLE's code context block openers. (GH-6960) #6962

^{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/terryjreedy'
closed_at = <Date 2018-05-18.03:24:23.791>
created_at = <Date 2018-05-17.23:34:19.015>
labels = ['3.8', 'expert-IDLE', 'type-feature', '3.7']
title = "IDLE: add 'async' to codecontext block openers"
updated_at = <Date 2018-05-18.03:24:23.790>
user = 'https://github.com/terryjreedy'

bugs.python.org fields:

activity = <Date 2018-05-18.03:24:23.790>
actor = 'terry.reedy'
assignee = 'terry.reedy'
closed = True
closed_date = <Date 2018-05-18.03:24:23.791>
closer = 'terry.reedy'
components = ['IDLE']
creation = <Date 2018-05-17.23:34:19.015>
creator = 'terry.reedy'
dependencies = []
files = []
hgrepos = []
issue_num = 33564
keywords = ['patch']
message_count = 4.0
messages = ['316991', '316993', '316999', '317001']
nosy_count = 2.0
nosy_names = ['terry.reedy', 'miss-islington']
pr_nums = ['6960', '6961', '6962']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue33564'
versions = ['Python 3.6', 'Python 3.7', 'Python 3.8']

[terryjreedy]

I am just going to add 'async' to BLOCKOPENERS. I don't think this needs a particular test, as most of the openers are not used in the new tests added by bpo-32831. We could eventually expand the sample to have one of each opener.

[terryjreedy]

New changeset d89ca94 by Terry Jan Reedy in branch 'master':
bpo-33564: Add async to IDLE's code context block openers. (GH-6960)
d89ca94

[miss-islington]

New changeset eb4590e by Miss Islington (bot) in branch '3.6':
bpo-33564: Add async to IDLE's code context block openers. (GH-6960)
eb4590e

[terryjreedy]

New changeset b2a02b9 by Terry Jan Reedy (Miss Islington (bot)) in branch '3.7':
bpo-33564: Add async to IDLE's code context block openers. (GH-6960) (bpo-6961)
b2a02b9