* Functional tests now use alembic instead of sqlalchmey-migrate
to build and destroy test database.
* All tests now use a file-based sqlite db as opposed to an in-memory
database.
Partially-Implements: blueprint alembic-migrations
Change-Id: I77921366a05ba6f9841143af89c1f4059d8454c6
Depends-On: Ie8594ff339a13bf190aefa308f54e97ee20ecfa2