Revert "bts: limit stderr logging to NOTICE to avoid long write() to ext4 fs"
This reverts commit c3ab9ec33f37c6837fb8bcb0fa0bbd2e98781fb7.
Reducing logging verbosity did not help: we're still seeing the clock skew errors and restarts. This makes debugging harder, and is not relevant anymore because we've switched to tmpfs [1].
