Add pysqlite as explicit test dep

Change-Id: I90d2d43ebeab5f3b638acd45af26272e2119bf50
Workaround Migration issue with PostgreSQL

For unknown reason, SQLAlchemy-Migrate does not pass
the populate_default=True down to the ALTER TABLE statement.

Therefore, create the column in two steps, which
avoids the IntegrityError.

Fixes LP Bug 1068181

Change-Id: I30770d8b29ec442576a66fc07b2c78e2440fb328
Merge "Workaround Migration issue with PostgreSQL"
Merge "Add pysqlite as explicit test dep"