gsutil_util: Add detailed logging for crbug.com/639314

This is for debugging the canary AUTest failures.
Logs return code, stdout, stderr from gsutil, and
the pattern matching logic in GetGSNamesWithWait.

This must be reverted when the issue is resolved.

BUG=chromium:639314
TEST=Manually run full_release_test.py

Change-Id: Id07dfc7a1251eab69a683eb9649cbf2811e7db7b
Signed-off-by: Ben Zhang <benzh@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/374473
Reviewed-by: Nicolas Boichat <drinkcat@chromium.org>
1 file changed