Copy this CPython test change

I am not exactly sure why this ends up failing, but on my 15.10
machine I get the SSLv3 protocol but it ends up failing when the
test tries to connect.

CPython made this change, so copy it.

from_cpython/Lib/test/test_ftplib.py

@@ -693,7 +693,7 @@ class TestTLS_FTPClass(TestCase):
 
     def test_auth_ssl(self):
         try:
-            self.client.ssl_version = ssl.PROTOCOL_SSLv3
+            self.client.ssl_version = ssl.PROTOCOL_SSLv23
             self.client.auth()
             self.assertRaises(ValueError, self.client.auth)
         finally: