Strip port 80/443 from host

[edward-codecov]

Supplying port 80 or 443 with host (ex. storage.googleapis.com:443) fails in v4 signing. Remove these default ports to prevent signature matching failure.

Similar issue:
aws/aws-cli#2883

[sinhaashish]

@edward-codecov Thanks for you PR.
IMO you can try something like

 url_parts = urlsplit(url)
        default_ports = {
            'http': 80,
            'https': 443
        }
        if any(url_parts.scheme == scheme and url_parts.port == port
               for scheme, port in default_ports.items()):
            # No need to include the port if it's the default port.
            return url_parts.hostname

This way we keep a track that if port 80 is stripped then it belongs to http and 443 for https.
This is a better way than just stripping with the use of if condition like the one you did if parsed_url.port is 80 or 443:

[edward-codecov]

@sinhaashish great idea; thanks! updated pr.

[sinhaashish]

Tested & LGTM

[vadmeste]

LGTM & tested