Update CC_net code to make it can be run in Spark cluster

[junwan-db]

Update CC_net to make it can be run in Spark cluster:

1. Create Spark executor to split tasks and running tasks parallelly
2. Update config to adopt spark execution mode
3. Support Output files to DBFS in Databricks
4. Fix out-of-date code and small issues.

Tested in a Databricks cluster running in Spark.

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