[soundwave] On finalization terminate pool, don't close.
[soundwave] On finalization terminate pool, don't close.

When there is an error (or e.g. the user tries Ctrl+C to keyboard
interrupt), pool.close() will wait for all existing jobs to finish.

Instead pool.terminate() will promptly shut everything down and
quit.

Bug: chromium:907885
Change-Id: I452ebedbe6a58be14166c3afeaa77a6d0141696a
Reviewed-on: https://chromium-review.googlesource.com/c/1347990
Commit-Queue: Juan Antonio Navarro Pérez <1649bb5e6b9eafe026580e338065dc64ba6b80b2@chromium.org>
Reviewed-by: Sami Kyöstilä <aa8b77df5d887ec30b6fa9e5e60a727a5eeba345@chromium.org>

catapult-project/catapult,catapult-project/catapult,catapult-project/catapult,catapult-project/catapult,catapult-project/catapult,catapult-project/catapult,catapult-project/catapult