[14/14] spark git commit: [SPARK-9763][SQL] Minimize exposure of internal SQL classes.

[SPARK-9763][SQL] Minimize exposure of internal SQL classes. There are a few changes in this pull request: 1. Moved all data sources to execution.datasources, except the public JDBC APIs. 2. In order to maintain backward compatibility from 1, added a backward compatibility translation map in

[14/14] spark git commit: [SPARK-9763][SQL] Minimize exposure of internal SQL classes.

[SPARK-9763][SQL] Minimize exposure of internal SQL classes. There are a few changes in this pull request: 1. Moved all data sources to execution.datasources, except the public JDBC APIs. 2. In order to maintain backward compatibility from 1, added a backward compatibility translation map in