runner and all_tests should exit with failure on failing tests.

Otherwise the bots don't notice.

BUG=473924

Change-Id: Idb8cc4c255723ebbe2d52478040a70648910bf37
Reviewed-on: https://boringssl-review.googlesource.com/4232
Reviewed-by: Adam Langley <agl@google.com>
3 files changed