Set client fixture as function scoped

got some issues testing session stuff when the client was
shared amongst all tests, maybe it got old or something as well.
Getting a fresh client for each test was a lot better

tests/integration/conftest.py

@@ -217,7 +217,7 @@ def localhost_using_legacy_db():
     conn.commit()
 
 
-@pytest.fixture(scope='session')
+@pytest.fixture(scope='function')
 def client(admin_username, admin_password):
     """Provides a Django test Client object already logged in to the web UI as
     an admin"""