test1471/2: add http as a required feature

curl bails out early with a different error message if http support is
compiled out.

Ref: #10705

hostip: refuse to resolve the .onion TLD

RFC 7686 states that:

> Applications that do not implement the Tor
> protocol SHOULD generate an error upon the use of .onion and
>

hostip: refuse to resolve the .onion TLD

RFC 7686 states that:

> Applications that do not implement the Tor
> protocol SHOULD generate an error upon the use of .onion and
> SHOULD NOT perform a DNS lookup.

Let's do that.

https://www.rfc-editor.org/rfc/rfc7686#section-2

Add test 1471 and 1472 to verify

Fixes #543
Closes #10705

show more ...