[TLS] Update test keys to >= 2048bit

[tiran]

BPO	34399
Nosy	@tiran
PRs	bpo-34399: 2048 bits RSA keys and DH params #8762 [3.7] bpo-34399: 2048 bits RSA keys and DH params (GH-8762) #8763 [3.6] bpo-34399: 2048 bits RSA keys and DH params (GH-8762) #8764 [2.7] bpo-34399: 2048 bits RSA keys and DH params (GH-8762) #8765 bpo-34399: Update test certs and keys #8994

^{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 = <Date 2018-08-15.07:43:41.819>
created_at = <Date 2018-08-14.08:46:29.715>
labels = ['3.7', 'expert-SSL', '3.8', 'type-bug', 'tests']
title = '[TLS] Update test keys to >= 2048bit'
updated_at = <Date 2018-08-29.14:35:34.007>
user = 'https://github.com/tiran'

bugs.python.org fields:

activity = <Date 2018-08-29.14:35:34.007>
actor = 'christian.heimes'
assignee = 'christian.heimes'
closed = True
closed_date = <Date 2018-08-15.07:43:41.819>
closer = 'christian.heimes'
components = ['Tests', 'SSL']
creation = <Date 2018-08-14.08:46:29.715>
creator = 'christian.heimes'
dependencies = []
files = []
hgrepos = []
issue_num = 34399
keywords = ['patch']
message_count = 5.0
messages = ['323504', '323507', '323524', '323525', '323555']
nosy_count = 1.0
nosy_names = ['christian.heimes']
pr_nums = ['8762', '8763', '8764', '8765', '8994']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue34399'
versions = ['Python 2.7', 'Python 3.6', 'Python 3.7', 'Python 3.8']

[tiran]

Downstream vendors have started to tighten security. 1024 bits RSA and DH params are no longer considered as secure. Python 3.7 and master already use 2048 bits RSA keys for some tests (bpo-32602). 3.6 and 2.7 don't have 1024bit keys. DH params and some other certs are still 1024 bits.

I'm going to update all keys and parameters to 2048.

[tiran]

New changeset 88bfd0b by Christian Heimes in branch 'master':
bpo-34399: 2048 bits RSA keys and DH params (bpo-8762)
88bfd0b

[tiran]

New changeset e3228a3 by Christian Heimes (Miss Islington (bot)) in branch '3.7':
bpo-34399: 2048 bits RSA keys and DH params (GH-8762) (GH-8763)
e3228a3

[tiran]

New changeset 1f34aec by Christian Heimes in branch '2.7':
[2.7] bpo-34399: 2048 bits RSA keys and DH params (GH-8762) (GH-8765)
1f34aec

[tiran]

New changeset 5e9551b by Christian Heimes in branch '3.6':
[3.6] bpo-34399: 2048 bits RSA keys and DH params (GH-8762) (GH-8764)
5e9551b