Redirect emulator output to stderr if a test fails
Redirect emulator output to stderr if a test fails

If a test fails, redirect emulator output to stderr so that it shows up
even when V=1 is not set.

BUG=chrome-os-partner:19235
TEST=Manual
BRANCH=None

Change-Id: I6d8e05eaa222ebe043556bfcd3f63ca7e27c2721
Signed-off-by: Vic Yang <5fd92abeee651458f98e2856f4f200ee971cee4d@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/51097
Reviewed-by: Vincent Palatin <70a9964ec8fd10b0b08fcc8623c2add25ddf99ac@chromium.org>

coreboot/chrome-ec,akappy7/ChromeOS_EC_LED_Diagnostics,alterapraxisptyltd/chromium-ec,coreboot/chrome-ec,fourier49/BIZ_EC,md5555/ec,akappy7/ChromeOS_EC_LED_Diagnostics,alterapraxisptyltd/chromium-ec,alterapraxisptyltd/chromium-ec,coreboot/chrome-ec,akappy7/ChromeOS_EC_LED_Diagnostics,eatbyte/chromium-ec,longsleep/ec,gelraen/cros-ec,thehobn/ec,md5555/ec,mtk09422/chromiumos-platform-ec,fourier49/BZ_DEV_EC,akappy7/ChromeOS_EC_LED_Diagnostics,eatbyte/chromium-ec,longsleep/ec,thehobn/ec,coreboot/chrome-ec,gelraen/cros-ec,eatbyte/chromium-ec,mtk09422/chromiumos-platform-ec,mtk09422/chromiumos-platform-ec,akappy7/ChromeOS_EC_LED_Diagnostics,longsleep/ec,mtk09422/chromiumos-platform-ec,longsleep/ec,gelraen/cros-ec,coreboot/chrome-ec,fourier49/BZ_DEV_EC,coreboot/chrome-ec,fourier49/BIZ_EC,gelraen/cros-ec,md5555/ec,fourier49/BZ_DEV_EC,alterapraxisptyltd/chromium-ec,md5555/ec,fourier49/BIZ_EC,fourier49/BZ_DEV_EC,fourier49/BIZ_EC,eatbyte/chromium-ec,thehobn/ec,thehobn/ec