recipes.cfg: Add option to use Bot-Commit+1.
recipes.cfg: Add option to use Bot-Commit+1.

Add option to use Bot-Commit+1 when landing trivial changes
instead of using TBR and self Code-Review+1.

Change-Id: I23d8fcc37f654274c4010da71a293025bf4edc3e
Reviewed-on: https://chromium-review.googlesource.com/c/infra/luci/recipes-py/+/2682811
Reviewed-by: Robbie Iannucci <40f3d43a28ebae3cb819288542e1c84d73d962d5@chromium.org>
Commit-Queue: Edward Lesmes <d05609f027dc667cc37492b1dc1bdea5d60fa82a@chromium.org>

luci/recipes-py,luci/recipes-py