Output stderr when run_test_scripts.sh fail
Output stderr when run_test_scripts.sh fail

This change makes run_test_scripts.sh dump stderr to the terminal
so that the failed test can be debugged. This is necessary to
analyze a failing test on build servers.

BUG=none
BRANCH=none
TEST=sudo FEATURES=test emerge vboot_reference && FEATURES=test
USE=minimal emerge-samus vboot_reference && make runtests

Change-Id: Id9ae0fb174cfe382ec30a1175f54c0891543c46e
Signed-off-by: Daisuke Nojiri <fd5f93af191bf7e8f73ea71cc3c0f66b41b1dd49@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/403428
Reviewed-by: Randall Spangler <62698fdbb84d1779579ee80c3f39fac22017e5bc@chromium.org>

coreboot/vboot,coreboot/vboot,coreboot/vboot,coreboot/vboot,coreboot/vboot