Add cinder cleanup to migrations.

After deep review actual db state and models i found
few tables in database skipped in db.models.
After moving of cinder in separate project these tables
were not removed.

Tables for deletion:
- sm_flavors
- sm_backend_config
- sm_volume
- virtual_storage_arrays
- volume_metadata
- volume_types
- volume_type_extra_specs
- shadow_sm_flavors
- shadow_sm_backend_config
- shadow_sm_volume
- shadow_virtual_storage_arrays
- shadow_volume_metadata
- shadow_volume_types
- shadow_volume_type_extra_specs

Blueprint: db-sync-models-with-migrations

Change-Id: I67e9f643419b1f43e544837c5e89470d274cd7ae
Merge "Add cinder cleanup to migrations."