PYTHON-2144 Properly require TLS for test_connect_with_ca_bundle

Author: ShaneHarvey

test/test_ssl.py

@@ -657,6 +657,7 @@ def test_mongodb_x509_auth(self):
         else:
             self.fail("Invalid certificate accepted.")
 
+    @client_context.require_ssl_certfile
     def test_connect_with_ca_bundle(self):
         def remove(path):
             try: