Add Project entity to openstack_provider module

@yas, please review this patch. This adds a `OpenStack tenant project` entity. This entity is automatically created when the users adds a Tenant.

This entity will hold information such as OpenStack `ProjectID`, user/pass for updating OpenStack cloud service provider. It will eventually be used when sharing a Project with someone else.

This check-in provides the following:
- `OpenStack tenant project` entity and associated CRUD
- When deleting a `Tenant`, the projects are cleaned up as well.
- any/own permission setup
- When adding a tenant, the selected regions are automatically created as `OpenStack tenant project` entities.
- A view block of the project entities are displayed on the Tenant page.

@baldwinlouie

Thank you for adding the entity. It looks good, so I'll merge the patch to 5.x, and close this issue as Fixed.

Automatically closed - issue fixed for 2 weeks with no activity.