net: use a consistent dnsConfig in hostLookupOrder
Use the same dnsConfig throughout a DNS lookup operation.
Before this CL it was possible to decide to re-read a
modified resolv.conf file during the DNS lookup,
which could lead to inconsistencies between the lookup order
and the name server list.
Change-Id: I0689749272b8263268d00b9a9cb4458cd68b23eb
GitHub-Last-Rev:
64810a22bc8a7dd5e804b5f5253d11b73942dfe3
GitHub-Pull-Request: golang/go#56690
Reviewed-on: https://go-review.googlesource.com/c/go/+/449337
Reviewed-by: Damien Neil <dneil@google.com>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Run-TryBot: Ian Lance Taylor <iant@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>