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* Change the default log level from DEBUG to INFO
* Change some logs from info() to debug()
* Show "Update ..." log only if a file is actually updated.
* Remove a raw |print| statement.

Bug: 578345, 767672
Change-Id: I6fa6e5f548cd48bf7bad38795db7f3828f045d61
Reviewed-on: https://chromium-review.googlesource.com/991340Reviewed-by: Quinten Yearsley <qyearsley@chromium.org>
Commit-Queue: Kent Tamura <tkent@chromium.org>
Cr-Commit-Position: refs/heads/master@{#547927}