[issue38063] Modify test_socket.py to use unittest test discovery

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

> See also #14408

In 2012, test_main() was used to skip a few test cases.

But since that time, the availability tests were moved from test_main() to the test case classes directly using unittest.skipIf or unittest.skipUnless decorators.

So now using unittest.main() became trivial.

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