Make sign_official_build.sh verify perform an additional rootfs sanity check using e2fsck.

This mirrors the change made for cros_make_image_bootable.

BUG=chromium-os:9578
TEST=manually ran verify on signed images including those with known rootfs corruptions.

Change-Id: I5dfdf1bfa975fbbbb4e010cd2adc6a3a7f08da15

Review URL: http://codereview.chromium.org/5367004
1 file changed