labpack: Remove deprecated code BUG=b:343654437 TEST=None Change-Id: I615be824913ea61b3916c0d52dcaab4977ab73e5 Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/labpack/+/5593956 Tested-by: Garry Wang <[email protected]> Owners-Override: Mike Frysinger <[email protected]> Reviewed-by: Otabek Kasimov <[email protected]> Commit-Queue: Garry Wang <[email protected]>