app-emulation/lxd: patch lxd to allow passing all usb

Use the following command to pass in all usb:
 lxc config device add <container name> <device name> usb

BUG=chromium:831850
TEST=cargo test

Change-Id: Ib66769398b8244149669c745d4fb3d657775f843
Reviewed-on: https://chromium-review.googlesource.com/1338156
Commit-Ready: Jingkui Wang <jkwang@google.com>
Tested-by: Jingkui Wang <jkwang@google.com>
Reviewed-by: Chirantan Ekbote <chirantan@chromium.org>
3 files changed