Issue #25940: Use self-signed.pythontest.net in SSL tests

This is instead of svn.python.org, whose certificate recently expired, and
whose new certificate uses a different root certificate.

The certificate used at the pythontest server was modifed to set the "basic
constraints" CA flag. This flag seems to be required for test_get_ca_certs_
capath() to work (in Python 3.4+).

Added the new self-signed certificate to capath with the following commands:

cp Lib/test/{selfsigned_pythontestdotnet.pem,capath/}
c_rehash -v Lib/test/capath/
c_rehash -v -old Lib/test/capath/
# Note the generated file names
cp Lib/test/capath/{selfsigned_pythontestdotnet.pem,0e4015b9.0}
mv Lib/test/capath/{selfsigned_pythontestdotnet.pem,ce7b8643.0}

The new server responds with "No route to host" when connecting to port 444.

Lib/test/capath/0e4015b9.0

+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----

Lib/test/capath/ce7b8643.0

+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----

Lib/test/https_svn_python_org_root.pem

------BEGIN CERTIFICATE-----
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------END CERTIFICATE-----

Lib/test/selfsigned_pythontestdotnet.pem

 -----BEGIN CERTIFICATE-----
-MIIChzCCAfCgAwIBAgIJAKGU95wKR8pSMA0GCSqGSIb3DQEBBQUAMHAxCzAJBgNV
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@@ -8,9 +8,9 @@ b24gU29mdHdhcmUgRm91bmRhdGlvbjEjMCEGA1UEAwwac2VsZi1zaWduZWQucHl0
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 -----END CERTIFICATE-----

Misc/NEWS

@@ -21,6 +21,13 @@ Library
 
 - Issue #22931: Allow '[' and ']' in cookie values.
 
+Tests
+-----
+
+- Issue #25940: Changed test_ssl and test_httplib to use
+  self-signed.pythontest.net.  This avoids relying on svn.python.org, which
+  recently changed root certificate.
+
 
 What's New in Python 3.2.6?
 ===========================