[Django]-Install hstore extension for django tests

Super late but… For the new people asking the same question:

Django has its own function to create extensions using the migrations (which are executed before the tests), and the example is the HStore

https://docs.djangoproject.com/en/dev/ref/contrib/postgres/operations/#creating-extension-using-migrations

However…

For most extensions, this requires a database user with superuser privileges. If the Django database user doesn’t have the appropriate privileges, you’ll have to create the extension outside of Django migrations with a user that has them. In that case, connect to your Django database and run the query CREATE EXTENSION IF NOT EXISTS hstore;.