Remove error log when skipping automatically retries runners.
Remove error log when skipping automatically retries runners.

BUG=
R=maruel@chromium.org

Review URL: https://codereview.appspot.com/36670043

pombreda/swarming,pombreda/swarming,luci/luci-py,luci/luci-py,madecoste/swarming,luci/luci-py,luci/luci-py,pombreda/swarming,madecoste/swarming,madecoste/swarming,madecoste/swarming,pombreda/swarming