- vitrage-graph will execute the drivers.
- Simplify large data transfer from drivers to processor by obsoleting rpc.
- Drivers don't need to create the complete list by taking advantage of python
generators in order to conserve memory.
- Lowering the total signiture of vitrage processes.
- LockByDriver will enforce a driver does not run get_changes and get_all in parallel.
Story: 2004384
Change-Id: Ie713456b2df96e24d0b15d2362a666162bfb4300