Remove unused import.
Remove unused import.

R=iannucci

Change-Id: Ib35297b6635766b217a1e0524dc43695ac8d3c12
Reviewed-on: https://chromium-review.googlesource.com/c/infra/luci/recipes-py/+/1629688
Reviewed-by: Robbie Iannucci <40f3d43a28ebae3cb819288542e1c84d73d962d5@chromium.org>
Commit-Queue: Robbie Iannucci <40f3d43a28ebae3cb819288542e1c84d73d962d5@chromium.org>
Auto-Submit: Andrii Shyshkalov <a30c74fa30536fe7ea81ed6dec202e35e149e1fd@chromium.org>

luci/recipes-py,luci/recipes-py