Tests: Avoid MD5 or check for MD5 availablity

tiran

BPO	38270
Nosy	@vstinner, @tiran, @ned-deily, @encukou, @ambv, @stratakis, @miss-islington
PRs	bpo-38270: Check for hash digest algorithms and avoid MD5 #16382 [3.8] bpo-38270: Check for hash digest algorithms and avoid MD5 (GH-16382) #16393 bpo-38270: More fixes for strict crypto policy #16418 [3.8] bpo-38270: More fixes for strict crypto policy (GH-16418) #16437 bpo-38270: Fix indentation of test_hmac assertions #17446 [3.8] bpo-38270: Fix indentation of test_hmac assertions (GH-17446) #17450

^{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/tiran'
closed_at = None
created_at = <Date 2019-09-25.10:09:58.731>
labels = ['3.8', '3.7', 'tests', '3.9', 'performance']
title = 'Tests: Avoid MD5 or check for MD5 availablity'
updated_at = <Date 2019-12-05.16:51:37.334>
user = 'https://github.com/tiran'

bugs.python.org fields:

activity = <Date 2019-12-05.16:51:37.334>
actor = 'miss-islington'
assignee = 'christian.heimes'
closed = False
closed_date = None
closer = None
components = ['Tests']
creation = <Date 2019-09-25.10:09:58.731>
creator = 'christian.heimes'
dependencies = []
files = []
hgrepos = []
issue_num = 38270
keywords = ['patch']
message_count = 10.0
messages = ['353162', '353204', '353216', '353358', '353548', '353553', '354497', '357571', '357754', '357866']
nosy_count = 7.0
nosy_names = ['vstinner', 'christian.heimes', 'ned.deily', 'petr.viktorin', 'lukasz.langa', 'cstratak', 'miss-islington']
pr_nums = ['16382', '16393', '16418', '16437', '17446', '17450']
priority = 'high'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = 'resource usage'
url = 'https://bugs.python.org/issue38270'
versions = ['Python 3.7', 'Python 3.8', 'Python 3.9']