firewalld: Add IPv6 firewall rules.

BUG=brillo:252
TEST=Unit tests.

Change-Id: I784472ce5f0c7d0649b38e48bd23b3acba9ffbbc
Reviewed-on: https://chromium-review.googlesource.com/249982
Trybot-Ready: Jorge Lucangeli Obes <jorgelo@chromium.org>
Tested-by: Jorge Lucangeli Obes <jorgelo@chromium.org>
Reviewed-by: Alex Vakulenko <avakulenko@chromium.org>
Commit-Queue: Jorge Lucangeli Obes <jorgelo@chromium.org>
3 files changed