[release-branch.go1.12] net: fix test after 8.8.8.8 changed its reverse DNS name
Google's 8.8.8.8 DNS server used to reports its reverse DNS name
as ending in ".google.com". Now it's "dns.google.".
Change-Id: I7dd15f03239e5c3f202e471618ab867690cb4f9d
Reviewed-on: https://go-review.googlesource.com/c/go/+/169679
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
(cherry picked from commit
3089d189569ed272eaf2bc6c4330e848a46e9999)
Reviewed-on: https://go-review.googlesource.com/c/go/+/169717