Tweak logs

[rkistner]

Follow-up to #477.

This tweaks the "Configured logger with level ..." message to use the same logger, so it doesn't appear out of place compared to the rest of the logs.

This also removes the "fatal" log level, which is not a valid one currently.

It is still an issue that the first log lines do not respect the config. I'm not sure if there is a good solution for that when we're loading the config from a file though (although we can technically do the configuration earlier if it's via env vars).

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Latest commit: 3004718

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