run_suite: be a little more verbose about why exactly are we failing out

BUG=none
TEST=run it

Change-Id: Iec7ff9a7bd90c043e5eb20b23831f3f4d7414f4e
Reviewed-on: https://gerrit.chromium.org/gerrit/26110
Reviewed-by: Chris Masone <cmasone@chromium.org>
Commit-Ready: Zdenek Behan <zbehan@chromium.org>
Tested-by: Zdenek Behan <zbehan@chromium.org>
1 file changed