Update tests from asyncore to asyncio

[arhadthedev]

BPO	47015
Nosy	@josiahcarlson, @giampaolo, @asvetlov, @1st1, @arhadthedev
PRs	bpo-47015: Update test_os from asyncore to asyncio #31876

^{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 2022-03-20.14:39:53.501>
created_at = <Date 2022-03-14.20:38:01.268>
labels = ['type-feature', 'tests', '3.11']
title = 'Update tests from asyncore to asyncio'
updated_at = <Date 2022-03-20.14:39:53.500>
user = 'https://github.com/arhadthedev'

bugs.python.org fields:

activity = <Date 2022-03-20.14:39:53.500>
actor = 'asvetlov'
assignee = 'none'
closed = True
closed_date = <Date 2022-03-20.14:39:53.501>
closer = 'asvetlov'
components = ['Tests']
creation = <Date 2022-03-14.20:38:01.268>
creator = 'arhadthedev'
dependencies = []
files = []
hgrepos = []
issue_num = 47015
keywords = ['patch']
message_count = 3.0
messages = ['415185', '415518', '415608']
nosy_count = 6.0
nosy_names = ['josiahcarlson', 'giampaolo.rodola', 'stutzbach', 'asvetlov', 'yselivanov', 'arhadthedev']
pr_nums = ['31876']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue47015'
versions = ['Python 3.11']

[arhadthedev]

PEP-594 – Removing dead batteries from the standard library [1] removes asyncore and asynchat in 3.12 with the following note:

The asyncore module is also used in stdlib tests. The tests for ftplib, logging, smptd, smtplib, and ssl are partly based on asyncore. These tests must be updated to use asyncio or threading.

(Note: the tests for os module are not mentioned and smtpd will be removed in 3.12 along with its tests anyway)

I'm performing the update now to avoid keeping asynchat and asyncore as private subpackages of test package.

[1] https://peps.python.org/pep-0594/

[arhadthedev]

The PR is ready for a review; I sorted out all bugs.

[asvetlov]

New changeset 3ae975f by Oleg Iarygin in branch 'main':
bpo-47015: Update test_os from asyncore to asyncio (GH-31876)
3ae975f