psycopg: Don't include conn info in exception
When trying to get a pooled_psycopg2 connection, the _get_pool() method checks the connection args against the pool args and raises an exception if the two differ. This leads to an internal server error, which results in logging the connection and pool info / args, which include the DB password, and, depending on the deployment, it might also send them via email to the admins. Log the connection and pool args only when log level is set to debug, and remove them from the exception message, so that they won't end up being send via email.
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