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/787175Reviewed-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>