vm_cicerone: add LXD container methods and signals

Add the initial supported methods and signals for
direct control of LXD via tremplin.

BUG=chromium:844079
TEST=none

Change-Id: I6cd48124d290821762913f0b5daf8995067e9d44
Reviewed-on: https://chromium-review.googlesource.com/1096896
Commit-Ready: Stephen Barber <smbarber@chromium.org>
Tested-by: Stephen Barber <smbarber@chromium.org>
Reviewed-by: Stephen Barber <smbarber@chromium.org>
2 files changed