Better log levels in the message publisher
Better log levels in the message publisher

Having the entire payload logged at the "INFO" level is not ideal due to
the following reasons:
- PII data might be contained there and there is no way to fitler it out
- Payload might be big enough that logging aggregators might struggle with
the sheer amount of data
- Since the log level is shared by reusing the rails/sinatra logger, INFO
level might be too verbose for hutch but WARN level not verbose enough for
the other.

While initially I considered implementing a feature to allow for filtering
the payload for PII or triming the output, a quick solution to all problems
listed above is to change the logging statement to DEBUG, which should only
be needed in development/testing environments.

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