skylab_suite: Log exception when suppressing failure

BUG=chromium:887580
TEST=Let it fail

Change-Id: I53bbccbc378d0ac0f16fffb1c47fedbbf368ceb1
Reviewed-on: https://chromium-review.googlesource.com/1246741
Commit-Ready: Prathmesh Prabhu <pprabhu@chromium.org>
Tested-by: Prathmesh Prabhu <pprabhu@chromium.org>
Reviewed-by: Allen Li <ayatane@chromium.org>
diff --git a/venv/skylab_suite/cmd/run_suite_skylab.py b/venv/skylab_suite/cmd/run_suite_skylab.py
index 208addc..259db9d 100755
--- a/venv/skylab_suite/cmd/run_suite_skylab.py
+++ b/venv/skylab_suite/cmd/run_suite_skylab.py
@@ -77,7 +77,7 @@
     try:
         suite_job.prepare()
     except Exception as e:
-        logging.error('Infra failure in setting up suite job: %s', str(e))
+        logging.exception('Infra failure in setting up suite job')
         return run_suite_common.SuiteResult(
                 run_suite_common.RETURN_CODES.INFRA_FAILURE)