Comment 28 for bug 1604879

Actually patch https://review.openstack.org/#/q/Iead5167210c4132badb866afc25d4ef14e27f6b2,n,z doesn't fix the main issue: object storage still isn't deployed if ceph selected for images but not for objects. That's why I've introduced another patch https://review.openstack.org/#/q/If319845aa9f2d9b3ca07936350ef374f504679cb,n,z which makes possible to swift been installed for object-store if ceph used only for image service.