buffet: Move commands/dbus_* our of libweave This code is owned by buffet now. BUG=brillo:1245 TEST='FEATURES=test emerge-gizmo buffet' Change-Id: I148336aba06a89167539fdd8d987080ec4cda82d Reviewed-on: https://chromium-review.googlesource.com/287126 Commit-Queue: Vitaly Buka <vitalybuka@chromium.org> Tested-by: Vitaly Buka <vitalybuka@chromium.org> Reviewed-by: Vitaly Buka <vitalybuka@chromium.org>