This update try to fix some problems:
1. define the 'id' both in _data_fields and _auto_generated_attrs.
2. some of tables don't have the 'id' field.
3. _data_fields of DBInstance miss some table fields.
4. Change the key of persisted_models as the same of table name to
make it more readable.
Change-Id: I0ad96824e8de978ff5b6766085549b1e1a2509cf
Signed-off-by: zhanggang <zhanggang@cmss.chinamobile.com>
474b0b3aaa