commit 78f8585339f149ea17db3d61cc3358dc9affed74
author Lorenzo Colitti <lorenzo@google.com> Tue Jun 05 15:44:23 2018 +0900
committer Lorenzo Colitti <lorenzo@google.com> Tue Jun 05 16:12:41 2018 +0900
tree ba2dd1ce36412e1a4fdb4a37cb16d13dd9fa3120
parent cd670e7957207d6f92eedab61035d0e7d9fa131e

Wait a few seconds for IPv6 connectivity to appear.

Currently, DnsTest immediately executes a DNS lookup as soon as
it starts. If the device has just connected to a network - as it
might if the test framework has just enabled wifi - and IPv6
connectivity is not yet available, the test will fail with little
proof that the network doesn't have IPv6.

Fix this by waiting for IPv6 connectivity and by adding the
active LinkProperties to the failure message.

Bug: 109670546
Test: DnsTest passes on dual-stack network
Test: DnsTest fails on IPv4-only network
Change-Id: I88b8d001f08fe41af666bccf8094c67729dda9c2