Open Stack

I've completed this work. The two patches to migrate the code over and
one additional bug fix are:

Horizon: Copy os-nova-servers from searchlight ui
  https://review.openstack.org/#/c/444095/

Searchlight UI: Remove os-nova-servers resource type
  https://review.openstack.org/#/c/450067/   (depends-on 444095)

Searchlight UI: Resource detail views have moved
  https://review.openstack.org/#/c/450068/

I have tested Searchlight UI and it doesn't break with the additional
resource type registered, however:

1. There is duplication of actions in the action dropdown for instances rows.
2. The details page link is broken, which is addressed in the separate
bug patch above.
3. The Horizon-side instances list is confused when an unmodified
Searchlight UI is installed - table columns are also duplicated.


    Richard