net: make go resolver aware of network parameter

Currently, the go resolver always send two DNS queries (A and AAAA) even
if tcp4/udp4/ip4 or tcp6/udp6/ip6 is used. This can cause unwanted
latencies when making IPv4-only or IPv6-only connections.

This change make go resolver aware of network parameter. Now, only one A
query is sent when tcp4/udp4/ip4 is used, and vice versa for
tcp6/udp6/ip6.

Fixes #45024

Change-Id: I815f909e6df5f7242cfc900f7dfecca628c3a2c8
GitHub-Last-Rev: 3d30c486dedd0d211366b1989034480a22ef2ffc
GitHub-Pull-Request: golang/go#45016
Reviewed-on: https://go-review.googlesource.com/c/go/+/301709


Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Trust: Emmanuel Odeke <emmanuel@orijtech.com>