Make macOS tests optional on Azure Pipelines

[zooba]

BPO	38089
Nosy	@zware, @zooba
PRs	Doc: Fix PDF build (NoUri). #15739 bpo-38089: Move Azure Pipelines to latest VM versions and make macOS tests optional #15851 [3.8] bpo-38089: Move Azure Pipelines to latest VM versions and make macOS tests optional (GH-15851) #15879 [3.7] bpo-38089: Move Azure Pipelines to latest VM versions and make macOS tests optional (GH-15851) #15880 [3.7] bpo-38089: Move Azure Pipelines to latest VM versions and make macOS tests optional (GH-15851) #15888

^{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/zooba'
closed_at = <Date 2019-09-11.09:16:07.124>
created_at = <Date 2019-09-10.13:04:47.787>
labels = ['3.8', 'type-feature', '3.7', '3.9', 'build']
title = 'Make macOS tests optional on Azure Pipelines'
updated_at = <Date 2019-09-11.09:16:07.123>
user = 'https://github.com/zooba'

bugs.python.org fields:

activity = <Date 2019-09-11.09:16:07.123>
actor = 'steve.dower'
assignee = 'steve.dower'
closed = True
closed_date = <Date 2019-09-11.09:16:07.124>
closer = 'steve.dower'
components = ['Build']
creation = <Date 2019-09-10.13:04:47.787>
creator = 'steve.dower'
dependencies = []
files = []
hgrepos = []
issue_num = 38089
keywords = ['patch']
message_count = 4.0
messages = ['351639', '351712', '351724', '351730']
nosy_count = 2.0
nosy_names = ['zach.ware', 'steve.dower']
pr_nums = ['15739', '15851', '15879', '15880', '15888']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue38089'
versions = ['Python 3.7', 'Python 3.8', 'Python 3.9']

[zooba]

Avoid blocking PRs because of random macOS failures (such as in bpo-37245).

Also reduce the timeout.

[zware]

New changeset 801f925 by Zachary Ware (Steve Dower) in branch 'master':
bpo-38089: Move Azure Pipelines to latest VM versions and make macOS tests optional (GH-15851)
801f925

[zooba]

New changeset cdce233 by Steve Dower (Miss Islington (bot)) in branch '3.8':
bpo-38089: Move Azure Pipelines to latest VM versions and make macOS tests optional (GH-15851)
cdce233

[zooba]

New changeset 6a494e7 by Steve Dower in branch '3.7':
bpo-38089: Move Azure Pipelines to latest VM versions and make macOS tests optional (GH-15851)
6a494e7