vboot: unify common.sh for testing scripts

Use tests/common.sh instead of tests/futility/common.sh.
Correct SCRIPT_DIR value to allow running run_test_scripts.sh
standalone without using Makefile.

BUG=b:124141368, chromium:605348
TEST=make clean && make runfutiltests
BRANCH=none

Change-Id: I107952826ea9a3a3816d9c13206aa48bee63ac6c
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/vboot_reference/+/2014236
Tested-by: Joel Kitching <kitching@chromium.org>
Commit-Queue: Joel Kitching <kitching@chromium.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>
14 files changed