ipv6: use of internal/netreflect package

Change-Id: Idb2a2eb354c2835e6cae7e269730c599abb1c8d7
Reviewed-on: https://go-review.googlesource.com/27735
Run-TryBot: Mikio Hara <mikioh.mikioh@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
19 files changed