trunks: Added creation of salting key in ownership flow

BUG=chromium:415999
TEST=unit and manual

Change-Id: Ia36067d380f3006dc2bb440e50eb553ca3ab693e
Reviewed-on: https://chromium-review.googlesource.com/234052
Reviewed-by: Darren Krahn <dkrahn@chromium.org>
Tested-by: Utkarsh Sanghi <usanghi@chromium.org>
Commit-Queue: Utkarsh Sanghi <usanghi@chromium.org>
8 files changed