Unify logging.handlers.SysLogHandler behavior with SocketHandlers

[cybergrind]

BPO	44291
Nosy	@vsajip, @cybergrind
PRs	bpo-44291: Fix reconnection in logging.handlers.SysLogHandler (GH-26490) #26490

^{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 2021-08-05.17:29:37.906>
created_at = <Date 2021-06-02.18:31:52.216>
labels = ['type-feature', 'library', '3.11']
title = 'Unify logging.handlers.SysLogHandler behavior with SocketHandlers'
updated_at = <Date 2021-08-05.17:29:37.906>
user = 'https://github.com/cybergrind'

bugs.python.org fields:

activity = <Date 2021-08-05.17:29:37.906>
actor = 'vinay.sajip'
assignee = 'none'
closed = True
closed_date = <Date 2021-08-05.17:29:37.906>
closer = 'vinay.sajip'
components = ['Library (Lib)']
creation = <Date 2021-06-02.18:31:52.216>
creator = 'cybergrind'
dependencies = []
files = []
hgrepos = []
issue_num = 44291
keywords = ['patch']
message_count = 6.0
messages = ['394932', '394935', '394998', '394999', '395168', '399005']
nosy_count = 3.0
nosy_names = ['vinay.sajip', 'python-dev', 'cybergrind']
pr_nums = ['26490']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue44291'
versions = ['Python 3.11']

[cybergrind]

Probably we should make the behavior of SysLogHandler consistent with other Socket handlers.

Right now SocketHandler and DatagramHandler implement such behavior:

1. on close set self.socket = None
2. when trying to send - make socket when it is None

SysLogHandler doesn't implement this behavior and when you close the socket for some reason (eg. restart of uWSGI server on code change) it leaves it in the closed state, then raises an error when you try to send any message because it is closed

--- Logging error ---
Traceback (most recent call last):
 File "/usr/lib/python3.9/logging/handlers.py", line 959, in emit
 self.socket.sendto(msg, self.address)
OSError: [Errno 9] Bad file descriptor