[GitHub] [incubator-superset] mistercrunch opened pull request #5830: Get 'Test Connection' button to take 'engine_params' into account

[GitHub]

I was connecting BigQuery and realized that the 'Test Connection' was 
disregarding the `extras` parameters. This addressed it:
<img width="691" alt="screen shot 2018-09-05 at 10 19 33 pm" 
src="https://user-images.githubusercontent.com/487433/45136611-cd567080-b159-11e8-99f8-cffd020acb6e.png";>


[ Full content available at: 
https://github.com/apache/incubator-superset/pull/5830 ]
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