Use cros_logging instead of cros_build_lib.Info

Replace all instances of cros_build_lib.Info with cros_logging.info
in crostestutils.

BUG=brillo:600
TEST=trybot

Change-Id: Ie0b1c909eaf32412b159f0579ac9fd0417966332
Reviewed-on: https://chromium-review.googlesource.com/261971
Reviewed-by: Don Garrett <dgarrett@chromium.org>
Commit-Queue: Ralph Nathan <ralphnathan@chromium.org>
Trybot-Ready: Ralph Nathan <ralphnathan@chromium.org>
Tested-by: Ralph Nathan <ralphnathan@chromium.org>
5 files changed