Let ConfigParser parse systemd units

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2017-09-20.08:40:09.170>
labels = ['3.8', 'type-feature', 'library']
title = 'Let ConfigParser parse systemd units'
updated_at = <Date 2021-09-02.23:45:07.318>
user = 'https://github.com/johnlinp'

bugs.python.org fields:

activity = <Date 2021-09-02.23:45:07.318>
actor = 'cooperlees'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2017-09-20.08:40:09.170>
creator = 'johnlinp'
dependencies = []
files = []
hgrepos = []
issue_num = 31528
keywords = []
message_count = 1.0
messages = ['302604']
nosy_count = 5.0
nosy_names = ['mcepl', 'lukasz.langa', 'cooperlees', 'bbayles', 'johnlinp']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue31528'
versions = ['Python 3.8']