Call alembic migrations after sqlalchemy-migrate

Removed version parameter from storage.upgrade method since it was never
used and partial upgrade is not supported by the code base

Removed downgrade call from db_sync since it's never used

Implements blueprint convert-to-alembic

Change-Id: I2aeabc111e5d3728fdcd0df45bf56f0aa68ed199
Merge "Call alembic migrations after sqlalchemy-migrate"