It is not possible to set the success parameter when running a BigQueryOperation job

[jswarburton]

When using the BiqQueryOperator to trigger a BigQuery load job one has to set the success parameter on the BigQueryOperation. It is not possible to set this field and without it set a NullPointerException is thrown when running the job.

This is not caught by the tests as the success method is package private, so can be called in the tests but cannot be called externally.

https://github.com/spotify/flo/blob/master/contrib/flo-bigquery/src/main/java/com/spotify/flo/contrib/bigquery/BigQueryOperation.java

[jswarburton]

Fixed by #210