typecd: Add user and group

BUG=b:152251292
TEST=None

Change-Id: Id38547b805d6fb57eccf63de7917aa064733fff2
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/eclass-overlay/+/2155487
Reviewed-by: Allen Webb <allenwebb@google.com>
Reviewed-by: Benson Leung <bleung@google.com>
Tested-by: Prashant Malani <pmalani@chromium.org>
Commit-Queue: Prashant Malani <pmalani@chromium.org>
Auto-Submit: Prashant Malani <pmalani@chromium.org>