If we can't create a certificate, print a warning, but don't fail the test. Modified patch from what Bill Janssen sent on python-3000.
If we can't create a certificate, print a warning, but don't fail the test.
Modified patch from what Bill Janssen sent on python-3000.

sk-/python2.7-type-annotator,sk-/python2.7-type-annotator,sk-/python2.7-type-annotator