Revert "[autotest] temporarily disable suite timeline report"

This reverts commit 229a76d01e67124606cebabaf62fc56f256a691e.

Reason for revert: We have evidence that this was not responsible for
the additional load experienced so undo this change.

Original change's description:
> [autotest] temporarily disable suite timeline report
>
> Temporarily disable the suite timeline report to test whether it causes
> the load on master db.
>
> BUG=chromium:695287
> TEST=None
>
> Change-Id: I8b58b17b8f0923dd6d4c663e79fd163662009d5b
> Reviewed-on: https://chromium-review.googlesource.com/446897
> Tested-by: Shuqian Zhao <shuqianz@chromium.org>
> Trybot-Ready: Shuqian Zhao <shuqianz@chromium.org>
> Reviewed-by: Aviv Keshet <akeshet@chromium.org>
> Commit-Queue: Shuqian Zhao <shuqianz@chromium.org>
>

TBR=akeshet@chromium.org,shuqianz@chromium.org
# Not skipping CQ checks because original CL landed > 1 day ago.
BUG=chromium:697909

Change-Id: If059b97b5098fdab21873fbdc65429d0b2ea4d18
Reviewed-on: https://chromium-review.googlesource.com/448667
Commit-Ready: David Riley <davidriley@chromium.org>
Tested-by: David Riley <davidriley@chromium.org>
Reviewed-by: Richard Barnette <jrbarnette@google.com>
diff --git a/scheduler/postjob_task.py b/scheduler/postjob_task.py
index b13604d..67733f5 100644
--- a/scheduler/postjob_task.py
+++ b/scheduler/postjob_task.py
@@ -318,7 +318,7 @@
 
     def _generate_command(self, results_dir):
         return [_parser_path, '--write-pidfile', '--record-duration',
-                '-l', '2', '-r', '-o', results_dir]
+                '--suite-report', '-l', '2', '-r', '-o', results_dir]
 
 
     @property