test_nntplib: sporadic failures, network isses? server down?

BPO	19756
Nosy	@pitrou, @vstinner, @berkerpeksag, @vadmium, @miss-islington
PRs	bpo-19756: Prevent test failures due to EADDRNOTAVAIL #9446 [3.7] bpo-19756: Prevent test failures due to EADDRNOTAVAIL (GH-9446) #9447 [3.6] bpo-19756: Prevent test failures due to EADDRNOTAVAIL (GH-9446) #9448 [2.7] bpo-19756: Prevent test failures due to EADDRNOTAVAIL (GH-9446) #9450 bpo-19756: Change remote NNTP server to localhost server for most tests #9461
Files	test_nntplib_logs.txt nntp-server.patch: Custom local server original-order.diff: Smaller diff representing above changes multi-connect.patch: Each test creates new connection

^{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 = None
created_at = <Date 2013-11-24.18:07:31.280>
labels = ['3.7', '3.8', 'type-bug', 'tests']
title = 'test_nntplib: sporadic failures, network isses? server down?'
updated_at = <Date 2020-05-22.21:28:12.797>
user = 'https://github.com/vstinner'

bugs.python.org fields:

activity = <Date 2020-05-22.21:28:12.797>
actor = 'chris.jerdonek'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Tests']
creation = <Date 2013-11-24.18:07:31.280>
creator = 'vstinner'
dependencies = []
files = ['43441', '43464', '43478', '46018']
hgrepos = []
issue_num = 19756
keywords = ['patch', 'buildbot']
message_count = 25.0
messages = ['204248', '204262', '223333', '245587', '268742', '268745', '268841', '268882', '283915', '292451', '297123', '325821', '325857', '325861', '325873', '325875', '325878', '325885', '325887', '325889', '325893', '325896', '325917', '325931', '369650']
nosy_count = 5.0
nosy_names = ['pitrou', 'vstinner', 'berker.peksag', 'martin.panter', 'miss-islington']
pr_nums = ['9446', '9447', '9448', '9450', '9461']
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue19756'
versions = ['Python 3.6', 'Python 3.7', 'Python 3.8']