test_stages: Add more logging

I still can't figure out where bvt-perbuild and bvt-cq are
dropped.

BUG=chromium:1092647
TEST=./run_pytest

Change-Id: Id87b6bcd5e130d9882c97bc64e84c4dcd05acca7
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/chromite/+/2246725
Tested-by: Dhanya Ganesh <dhanyaganesh@chromium.org>
Auto-Submit: Dhanya Ganesh <dhanyaganesh@chromium.org>
Reviewed-by: Sean Abraham <seanabraham@chromium.org>
Commit-Queue: Sean Abraham <seanabraham@chromium.org>
diff --git a/cbuildbot/stages/test_stages.py b/cbuildbot/stages/test_stages.py
index b7c2f68..98f009b 100644
--- a/cbuildbot/stages/test_stages.py
+++ b/cbuildbot/stages/test_stages.py
@@ -512,11 +512,13 @@
       #        off in parallel first.
       if suite_config.blocking:
         steps = [stage.Run for stage in parallel_stages]
+        logging.info('Launching %d tests', len(steps))
         parallel.RunParallelSteps(steps)
         parallel_stages = []
 
     if parallel_stages:
       steps = [stage.Run for stage in parallel_stages]
+      logging.info('Launching %d tests', len(steps))
       parallel.RunParallelSteps(steps)
 
   def _GetHWTestStage(self, builder_run, buildstore, board, model,
@@ -542,8 +544,12 @@
       # Python 3.7+ made async a reserved keyword.
       if getattr(suite_config, 'async'):
         stage_class = ASyncSkylabHWTestStage
+        logging.info('Launching async suite %s on %s',
+                     suite_config.suite, model.name)
       else:
         stage_class = SkylabHWTestStage
+        logging.info('Launching sync suite %s on %s',
+                     suite_config.suite, model.name)
 
       result = stage_class(
           builder_run,