Tests. Native handler

Test scenario:
1. Users based view with page and block displays, native handler, exposed filter by name.
2. Order users in first way, ensure order is saved.
3. Order users in different way, ensure order has been changed.
4. Apply exposed filter, save the order, ensure it has been changed and it is different from no exposed input provided.
5. Add users block somewhere, ensure sort order is the same as on page view.
6. Ensure block has contextual link to the page view.