Move down logging levels in mpl/__init__ to DEBUG. #10281
Most "info" level logs in the codebase are either reporting "mildly"
Moving the levels of the logs in
Would be nice to have this for 2.2 as that's the version that introduces use of logging.
In general, logging should be considered part of the API. Programs may be monitoring logs to catch warnings and errors, for example. Because we have so recently added use of the logging module we are free to tweak settings until we think we have it right, but I would not consider it as just documentation in the long run.