Use create_all instead of alembic upgrade in the tests

We use sqlite in the tests and sqlite does not support
alter column type for an existing table -
http://sqlite.org/lang_altertable.html

create_all flatterns the schema and applies in one (no alter columns)

Change-Id: Idabcb7dc48520398949ba098a66bc2f6f35333a8
Merge "Use create_all instead of alembic upgrade in the tests"