gh-149776: Skip UDP Lite tests if it's not supported

[vstinner]

Fix test_socket on Linux kernel 7.1 and newer: skip UDP Lite tests if it's not supported.

• Issue: test_socket: BasicUDPLITETest fails on Linux 7.1 and newer #149776

[vstinner]

!buildbot s390x Fedora Rawhide PR

[bedevere-bot]

🤖 New build scheduled with the buildbot fleet by @vstinner for commit cbda2c8 🤖

Results will be shown at:

https://buildbot.python.org/all/#/grid?branch=refs%2Fpull%2F149777%2Fmerge

The command will test the builders whose names match following regular expression: s390x Fedora Rawhide PR

The builders matched are:

• s390x Fedora Rawhide PR

[miss-islington-app]

Thanks @vstinner for the PR 🌮🎉.. I'm working now to backport this PR to: 3.13, 3.14, 3.15.
🐍🍒⛏🤖

[bedevere-app]

GH-149780 is a backport of this pull request to the 3.15 branch.

[bedevere-app]

GH-149781 is a backport of this pull request to the 3.14 branch.

[bedevere-app]

GH-149782 is a backport of this pull request to the 3.13 branch.

[bedevere-bot]

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot AMD64 FreeBSD Refleaks 3.13 (tier-3) has failed when building commit 49d0867.

What do you need to do:

1. Don't panic.
2. Check the buildbot page in the devguide if you don't know what the buildbots are or how they work.
3. Go to the page of the buildbot that failed (https://buildbot.python.org/#/builders/1615/builds/1722) and take a look at the build logs.
4. Check if the failure is related to this commit (49d0867) or if it is a false positive.
5. If the failure is related to this commit, please, reflect that on the issue and make a new Pull Request with a fix.

You can take a look at the buildbot page here:

https://buildbot.python.org/#/builders/1615/builds/1722

Failed tests:

• test_httpservers

Failed subtests:

• test_large_content_length_truncated - test.test_httpservers.CGIHTTPServerTestCase.test_large_content_length_truncated

Summary of the results of the build (if available):

==

Click to see traceback logs

Traceback (most recent call last):
  File "/buildbot/buildarea/3.13.ware-freebsd.refleak/build/Lib/test/test_httpservers.py", line 1028, in test_large_content_length_truncated
    res = self.request('/cgi-bin/file1.py', 'POST', b'x', headers)
  File "/buildbot/buildarea/3.13.ware-freebsd.refleak/build/Lib/test/test_httpservers.py", line 89, in request
    return self.connection.getresponse()
           ~~~~~~~~~~~~~~~~~~~~~~~~~~~^^
  File "/buildbot/buildarea/3.13.ware-freebsd.refleak/build/Lib/http/client.py", line 1450, in getresponse
    response.begin()
    ~~~~~~~~~~~~~~^^
  File "/buildbot/buildarea/3.13.ware-freebsd.refleak/build/Lib/http/client.py", line 336, in begin
    version, status, reason = self._read_status()
                              ~~~~~~~~~~~~~~~~~^^
  File "/buildbot/buildarea/3.13.ware-freebsd.refleak/build/Lib/http/client.py", line 305, in _read_status
    raise RemoteDisconnected("Remote end closed connection without"
                             " response")
http.client.RemoteDisconnected: Remote end closed connection without response


Traceback (most recent call last):
  File "/buildbot/buildarea/3.13.ware-freebsd.refleak/build/Lib/test/test_httpservers.py", line 1028, in test_large_content_length_truncated
    res = self.request('/cgi-bin/file1.py', 'POST', b'x', headers)
  File "/buildbot/buildarea/3.13.ware-freebsd.refleak/build/Lib/test/test_httpservers.py", line 89, in request
    return self.connection.getresponse()
           ~~~~~~~~~~~~~~~~~~~~~~~~~~~^^
  File "/buildbot/buildarea/3.13.ware-freebsd.refleak/build/Lib/http/client.py", line 1450, in getresponse
    response.begin()
    ~~~~~~~~~~~~~~^^
  File "/buildbot/buildarea/3.13.ware-freebsd.refleak/build/Lib/http/client.py", line 336, in begin
    version, status, reason = self._read_status()
                              ~~~~~~~~~~~~~~~~~^^
  File "/buildbot/buildarea/3.13.ware-freebsd.refleak/build/Lib/http/client.py", line 297, in _read_status
    line = str(self.fp.readline(_MAXLINE + 1), "iso-8859-1")
               ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^
  File "/buildbot/buildarea/3.13.ware-freebsd.refleak/build/Lib/socket.py", line 723, in readinto
    return self._sock.recv_into(b)
           ~~~~~~~~~~~~~~~~~~~~^^^
ConnectionResetError: [Errno 54] Connection reset by peer

[bedevere-app]

GH-153592 is a backport of this pull request to the 3.12 branch.

[bedevere-app]

GH-153593 is a backport of this pull request to the 3.11 branch.

[bedevere-app]

GH-153594 is a backport of this pull request to the 3.10 branch.