Remove invalid and incorrect port override
Remove invalid and incorrect port override

PyMongo's `parse_uri()` method does not include the port as a top-level key. It is the second item in a list of key/value pairs under the `nodelist` key. So not only will `pieces.get('port', None)` always return `None`, `pieces.get(port, None)` will also always return `None` since the port number will never be a key either.

:angry: at myself for that one.

Plus, when all's said and done, it `host` contains a URI, the entire URI will be passed into the connection, so capturing the port in `settings` wouldn't really accomplish anything.

dirn/Simon,dirn/Simon