`pathlib.Path.owner()` and `group()` use `pwd` and `grp` modules directly

[barneygale]

BPO	39901
Nosy	@barneygale
PRs	bpo-39901: Move pathlib.Path.owner() and group() implementations into the path accessor #18844

^{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 = <Date 2020-04-17.16:41:29.498>
created_at = <Date 2020-03-08.09:26:58.059>
labels = ['type-feature', 'library', '3.9']
title = '`pathlib.Path.owner()` and `group()` use `pwd` and `grp` modules directly'
updated_at = <Date 2020-04-17.16:41:29.497>
user = 'https://github.com/barneygale'

bugs.python.org fields:

activity = <Date 2020-04-17.16:41:29.497>
actor = 'pitrou'
assignee = 'none'
closed = True
closed_date = <Date 2020-04-17.16:41:29.498>
closer = 'pitrou'
components = ['Library (Lib)']
creation = <Date 2020-03-08.09:26:58.059>
creator = 'barneygale'
dependencies = []
files = []
hgrepos = []
issue_num = 39901
keywords = ['patch']
message_count = 2.0
messages = ['363643', '366663']
nosy_count = 1.0
nosy_names = ['barneygale']
pr_nums = ['18844']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue39901'
versions = ['Python 3.9']

[barneygale]

The implementations of Path.owner() and Path.group() directly import and use the pwd and grp modules. Given these modules provide information about the local system, I believe these implementations should instead live in pathlib._NormalAccessor for consistency with other methods that do "impure" things.

[pitrou]

New changeset 22386bb by Barney Gale in branch 'master':
bpo-39901: Move pathlib.Path.owner() and group() implementations into the path accessor. (GH-18844)
22386bb