don't create examples sqlite datasource

[tooptoop4]

how to not create it? I have mysql metastore and don't want any example datasource

seems like this line should have a config option:
https://github.com/apache/incubator-superset/blob/d81f720502375101b43ffe9e2e6c28c0687b00f9/superset/cli.py#L71

[mistercrunch]

Mmmmh, that line doesn't make sense as part of superset init

[mistercrunch]

Trying this #9881 hoping CI passes