fix python HTTPS encoding for python driver (#3379)

* fix python HTTPS encoding for python driver

* adding an if statement here to only do this if there is a username and password passed

* fixing if statement

* missed a colon

Author: llaskin

py/selenium/webdriver/remote/remote_connection.py

@@ -471,6 +471,10 @@ def _request(self, method, url, body=None):
             request.add_header('Accept', 'application/json')
             request.add_header('Content-Type', 'application/json;charset=UTF-8')
 
+            if parsed_url.username:
+                base64string = base64.b64encode('%s:%s' % (parsed_url.username, parsed_url.password))
+                request.add_header("Authorization", "Basic %s" % base64string)
+
             if password_manager:
                 opener = url_request.build_opener(url_request.HTTPRedirectHandler(),
                                                   HttpErrorHandler(),