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	[utils] Default SSL to TLS. (Fixes #3727)
On 2.x, we now try TLS first, and fall back to the compat 23 (basically anything) afterwards. On 3.4+, we now use the proper function so that we get all the latest security configurations. We allow SSLv3 though for the time being, since a lot of older pages use that. On 3.3, we default to SSLv23 (basically "anything, including TLS") because that has the widest compatibility.
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		@@ -617,7 +617,7 @@ def make_HTTPS_handler(opts_no_check_certificate, **kwargs):
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                    self.sock = sock
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                    self._tunnel()
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                try:
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                    self.sock = ssl.wrap_socket(sock, self.key_file, self.cert_file, ssl_version=ssl.PROTOCOL_SSLv3)
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                    self.sock = ssl.wrap_socket(sock, self.key_file, self.cert_file, ssl_version=ssl.PROTOCOL_TLSv1)
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                except ssl.SSLError:
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                    self.sock = ssl.wrap_socket(sock, self.key_file, self.cert_file, ssl_version=ssl.PROTOCOL_SSLv23)
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@@ -625,8 +625,14 @@ def make_HTTPS_handler(opts_no_check_certificate, **kwargs):
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            def https_open(self, req):
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                return self.do_open(HTTPSConnectionV3, req)
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        return HTTPSHandlerV3(**kwargs)
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    else:
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        context = ssl.SSLContext(ssl.PROTOCOL_SSLv3)
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    elif hasattr(ssl, 'create_default_context'):  # Python >= 3.4
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        context = ssl.create_default_context(ssl.Purpose.CLIENT_AUTH)
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        context.options &= ~ssl.OP_NO_SSLv3  # Allow older, not-as-secure SSLv3
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        if opts_no_check_certificate:
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            context.verify_mode = ssl.CERT_NONE
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        return compat_urllib_request.HTTPSHandler(context=context, **kwargs)
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    else:  # Python < 3.4
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        context = ssl.SSLContext(ssl.PROTOCOL_SSLv23)
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        context.verify_mode = (ssl.CERT_NONE
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                               if opts_no_check_certificate
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                               else ssl.CERT_REQUIRED)
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