DNS resolver returns `SocketAddr` which has meaningless port

[malaire]

DNS resolver returns SocketAddr with port even though port would only be meaningful if service is specified for underlying getaddrinfo. However that is not possible as DNS resolver only takes Name as input.

I think this should be fixed by changing return value to IpAddr instead of SocketAddr.

Alternatively DNS resolver could be changed to take service as input in addition to Name

[seanmonstar]

It used to resolve to IpAddrs, but it was changed in #2346, specifically to allow setting the IPv6 zone ID.

[malaire]

I don't see any mention of SocketAddrV6 supporting zone ID? How is that feature used here?

[seanmonstar]

The scope ID is another name for zone ID.

[malaire]

That can't work as zone ID is string while scope ID is integer?

[malaire]

Closing this as looks like that does have some use even though I don't see how it could be used (but then I havn't really used ipv6).