Add support for launching Avahi in network chroot

Avahi speaks to the outside world through DBus, and needs some
configuration files to be copied from the host.

BUG=chromium:412975
TEST=A test consuming these changes continues to work. network_VPN
variants continue to pass.

Change-Id: I36cc5fa2f078f46c1bfaca3865f3b13cb9a48e2f
Reviewed-on: https://chromium-review.googlesource.com/219628
Reviewed-by: Christopher Wiley <wiley@chromium.org>
Commit-Queue: Christopher Wiley <wiley@chromium.org>
Tested-by: Christopher Wiley <wiley@chromium.org>
1 file changed