Review possibility of race condition in output

[marianogappa]

By reviewing the code after successfully using it for months, it looks like a race condition in output would be possible:

• When querying multiple databases, each query runs on a separate goroutine. The n goroutines run in parallel and issue fmt.Println statements. Those are not concurrency-safe: http://stackoverflow.com/questions/14694088/is-it-safe-for-more-than-one-goroutine-to-print-to-stdout

log.Println is concurrency-safe but writes to std err.