Add loggers to clean up tests output

Added loggers to properly log the generated output from functions called while running tests.
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This uses a good pattern, which is to pass logger a string with format codes in it (`%s` in this case), and then pass the data for the formatting to logger -- this is as opposed to `"something %s something" % (variable)` as passed to the first parameter.

See https://docs.python.org/2/howto/logging.html#logging-variable-data and http://blog.hirokiky.org/2013/06/18/dont_format_before_logging_in_python.html