[Swan-dev] heads up: ip_address and ip_endpoint are distinct types

[Andrew Cagney]

I've just pushed a change making ip_address and ip_endpoint distinct.

- an address is just that 0.0.0.0 or ::
    - ipv4 or ipv6
- an endpoint is everything else needed to get a packet to travel from
one machine to another:
    - address
    - protocol
    - "port"