devserver: fix failing unit tests

This fixes gsutil_util unit tests, which have been failing since the
module's max retry attempts were decreased (currently only one attempt
is being made at gsutil runs).

BUG=None
TEST=Tests pass.

Change-Id: I732d73ff787cd23772827cf6f3723d0ac2873be6
Reviewed-on: https://chromium-review.googlesource.com/176968
Tested-by: Gilad Arnold <garnold@chromium.org>
Reviewed-by: Dan Shi <dshi@chromium.org>
1 file changed