Improve the output of the autoroll command.
Improve the output of the autoroll command.

With logging enabled, the SUCCESS/FAILED output does not end up on the
same line as the processing candidate line, logging from the roll
operation does. This change pushes the status to always be on a separate
line, which works well with the roll logging. It also logs the output
from the run/train operation, which can help to debug why some rolls
that only modify recipes.cfg are resulting in non-trivial rolls.

Change-Id: Id745e1c9d6bb754cd20b6bdd107b5a0bcc451117
Reviewed-on: https://chromium-review.googlesource.com/c/infra/luci/recipes-py/+/3094589
Commit-Queue: Garrett Beaty <a0767768af30bcbe01b6de5024355c539362a830@chromium.org>
Auto-Submit: Garrett Beaty <a0767768af30bcbe01b6de5024355c539362a830@chromium.org>
Reviewed-by: Robbie Iannucci <40f3d43a28ebae3cb819288542e1c84d73d962d5@chromium.org>

luci/recipes-py,luci/recipes-py