vm_au_worker: Output to stdout

Background is we like to run long run vmtest for informational purpose.
To prevent builder from stop working, we need to continuously output
things to stdout.

This CL Makes vm_au_worker output test result to stdout directly if
verbose is set.

TEST=run ctest locally
TEST=tryjob (Done)

Change-Id: I7c0b9a95411602ed094cb95ca711125ff76e0598
Reviewed-on: https://chromium-review.googlesource.com/646946
Commit-Ready: Po-Hsien Wang <pwang@chromium.org>
Tested-by: Po-Hsien Wang <pwang@chromium.org>
Reviewed-by: Daniel Wang <wonderfly@google.com>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
1 file changed