futility: updater: Fix logging messages

In CL:1601678, few logging messages were not properly converted:

- STATUS should add \n
- INFO and WARN should not need __FUNCTION__

BUG=None
TEST=make futil; tests/futility/run_test_scripts.sh $(pwd)/build/futility
BRANCH=None

Change-Id: Ib01d9319815a5fbb579e49391fc4bff9d61ca214
Signed-off-by: Hung-Te Lin <hungte@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/1626189
Legacy-Commit-Queue: Commit Bot <commit-bot@chromium.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>
3 files changed