Change log levels

Some of them were set incorrectly, e.g. something that caused the
daemon to exit was marked as just a warning, instead of an error.

Removed debug level as it was hard to decide whether something should
go into info or debug. This is mostly because the use of the debug level
wasn't well defined. Debug should be used for information that could
help a user to debug an issue, but messages marked as debug were by the
most part the "success" log messages, which could go into info level
instead.

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