Duplicate log lines

[tomasfarias]

The dbt loggers are producing multiple lines of output that are essentially the same, but one of them is the debug output.

This is caused by both the file logger and the stdout logger being fired off. We tried to clear the handlers from one of them in operators.dbt.BaseDbtOperator.override_dbt_logging but this is not working.

We should dig into this issue further to avoid verbose logging outputs.