GitLab

The test is failing when an entry is unexpectedly not in the DNS cache,
this CL adds some logging to the test and to the host cache, and
re-enables the test, to help diagnose the failures that are happening
on the bots.

Bug: 1042354
Change-Id: I6b241a279aafc7a65a20aaae510d96dd0c2576fe
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2033546
Commit-Queue: Matt Menke <mmenke@chromium.org>
Reviewed-by: Eric Orth <ericorth@chromium.org>
Cr-Commit-Position: refs/heads/master@{#737512}