SSL server requesting client certificates should send CA list

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2016-11-11.23:30:24.756>
labels = ['expert-SSL', 'type-bug', '3.7']
title = 'SSL server requesting client certificates should send CA list'
updated_at = <Date 2017-09-06.19:41:48.698>
user = 'https://bugs.python.org/kchen'

bugs.python.org fields:

activity = <Date 2017-09-06.19:41:48.698>
actor = 'christian.heimes'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['SSL']
creation = <Date 2016-11-11.23:30:24.756>
creator = 'kchen'
dependencies = []
files = []
hgrepos = []
issue_num = 28671
keywords = []
message_count = 2.0
messages = ['280620', '301503']
nosy_count = 5.0
nosy_names = ['janssen', 'christian.heimes', 'alex', 'kchen', 'dstufft']
pr_nums = []
priority = 'normal'
resolution = None
stage = 'needs patch'
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue28671'
versions = ['Python 3.7']