firewalld: Add "firewalld", a firewall daemon.

This commits adds the basic firewalld structure,
which allows to compile inside the chroot.

BUG=chromium:435400
TEST=Compiles, runs (empty) tests, installs.
CQ-DEPEND=CL:231714

Change-Id: Icca7f9b153b68775e3ff3af59f184be94bf66dc0
Reviewed-on: https://chromium-review.googlesource.com/231137
Reviewed-by: Jorge Lucangeli Obes <jorgelo@chromium.org>
Commit-Queue: Jorge Lucangeli Obes <jorgelo@chromium.org>
Tested-by: Jorge Lucangeli Obes <jorgelo@chromium.org>
5 files changed