bot_update: add mooooooore chars in logs.

Before, bot_update would print after command:
  Succeeded (Failed) in 0.1 mins
but figuring out which command takes a lot of scrolling/searching
for previous
  Running <cmd with args>
This CL fixes that:
  Succeeded (Failed) in 0.1 mins <cmd with args>



R=machenbach@chromium.org, maruel@chromium.org
TEST=end-to-end with led tool, but only on LUCI stack.

Bug: 749709
Change-Id: Id3031a12b9013ab136ea03cdf6d325930722e50f
Reviewed-on: https://chromium-review.googlesource.com/787175
Reviewed-by: Marc-Antoine Ruel <maruel@chromium.org>
Reviewed-by: Sergiy Byelozyorov <sergiyb@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Andrii Shyshkalov <tandrii@chromium.org>

recipes/recipe_modules/bot_update/resources/bot_update.py

@@ -184,13 +184,13 @@ def call(*args, **kwargs):  # pragma: no cover
   elapsed_time = ((time.time() - start_time) / 60.0)
   outval = out.getvalue()
   if code:
-    print '===Failed in %.1f mins===' % elapsed_time
+    print '===Failed in %.1f mins of %s ===' % (elapsed_time, ' '.join(args))
     print
     raise SubprocessFailed('%s failed with code %d in %s.' %
                            (' '.join(args), code, cwd),
                            code, outval)
 
-  print '===Succeeded in %.1f mins===' % elapsed_time
+  print '===Succeeded in %.1f mins of %s ===' % (elapsed_time, ' '.join(args))
   print
   return outval