cros_generate_update_payload: Remove excessive umount busy logging.

We've been chasing this umount busy bug for a long time, and this excessive
logging doesn't seem to help. Replace it with a pointer to the bug to
make life easier for sheriffs/deputies.

BUG=None
TEST=Not much.

Change-Id: I7ae8b821d66d1350309510fbb4deb3e50887d3aa
Reviewed-on: https://chromium-review.googlesource.com/217521
Tested-by: Don Garrett <dgarrett@chromium.org>
Reviewed-by: Yu-Ju Hong <yjhong@chromium.org>
Commit-Queue: Don Garrett <dgarrett@chromium.org>
1 file changed