Sample dags minor cleanup

[Alagappan]

Signed-off-by: Alagappan Sethuraman alagappan.als@gmail.com

Summary of Changes

Fixed couple of minor things in Sample Dags - removed unused kwargs params, renamed airflow tasks and set dag structure explicitly

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[feng-tao]

I actually prefer callable name the same as task_id which is less confusing.

[Alagappan]

Interesting. I was just trying to keep it consistent across all example dags. Let me know what is the standard practice within Airflow open source community and I can update the dags to follow the same pattern

[feng-tao]

actually I see other examples do this. Personally I would prefer to keep the same when task_id is short, but I think it is fine to change as well.