add runner initialization to debug messages

Yelp / mrjob

Run MapReduce jobs on Hadoop or Amazon Web Services

http://packages.python.org/mrjob/

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Closed coyotemarin closed 4 years ago

coyotemarin commented 4 years ago

Makes it a bit easier to understand how runners work. Fixes #2129

coyotemarin commented 4 years ago

Also makes _default_opts() a classmethod (though this isn't user-facing).