"certificate verify failed " and "CERTIFICATE_VERIFY_FAILED " as
some SSL libraries use different text than OpenSSL.

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.

Patch by Марк Коренберг.

Patch from Upendra Kumar.

Add another try/except PermissionError to avoid depending on listdir order. Fix issues #24120 and #26012.

Simplify str.find explaination as per Georg Brandl's suggestion.

values and meaning.

Patch contributed by Andrew Scheller.