CHERRY-PICK: Run postinst on release partition for usbimg

Currently we skip the verity table when installing release partition using
usbimg installation flow. To align with the normal installation flow
using mini-Omaha server, we should do postinst to create the verity
table. Then in factory we can check release rootfs instead of waiting
until finalize to run postinst.

BUG=chrome-os-partner:23654
TEST=run rma install flow and run verify_rootfs_verification test

Original Change-Id: Ib35d1e33efecbe62e1a27a339f8f3eedcf7e463d
Original Reviewed-on: https://chromium-review.googlesource.com/174867
Original Reviewed-by: Cheng-Yi Chiang <cychiang@chromium.org>
Original Commit-Queue: Cheng-Yi Chiang <cychiang@chromium.org>
Original Tested-by: Cheng-Yi Chiang <cychiang@chromium.org>

Change-Id: Id84ba4932a7fd63da5914a3a096e1318ba3a4623
Reviewed-on: https://chromium-review.googlesource.com/183219
Reviewed-by: Vic Yang <victoryang@chromium.org>
Commit-Queue: Cheng-Yi Chiang <cychiang@chromium.org>
Tested-by: Cheng-Yi Chiang <cychiang@chromium.org>
1 file changed