bb_log_monitor: Address post-review comments.
bb_log_monitor: Address post-review comments.

BUG=None
TEST=None
R=agable@chromium.org, pgervais@chromium.org

Review URL: https://codereview.chromium.org/1042503003

nicko96/Chrome-Infra,nicko96/Chrome-Infra,nicko96/Chrome-Infra,nicko96/Chrome-Infra,nicko96/Chrome-Infra