tests/hostname: disable failing test_hostname::test_hostname_ip on OpenBSD

[lcheylus]

On OpenBSD, test_hostname::test_hostname_ip fails with "failed to lookup address information: Name does not resolve" error

[sylvestre]

do you know why it is doing that ?

[lcheylus]

Because implementation for hostname -i (--ip-address) is not portable on BSD (FreeBSD, MacOS, OpenBSD) using hostname + ":1" address. I didn't look for the exact reason of this error.

There is a note in src/uu/hostname/src/hostname.rs :

if matches.get_flag(OPT_IP_ADDRESS) {
// XXX: to_socket_addrs needs hostname:port so append a dummy port and remove it later.
// This was originally supposed to use std::net::lookup_host, but that seems to be
// deprecated.  Perhaps we should use the dns-lookup crate?

Maybe this reverse DNS resolution for IP addr should be implemented otherwise on all OS.