Reorganise the tuskar files

The dashboards/infrastructure were moved to tuskar_ui, so were the
Tuskar API helpers. Non-tuskar files were removed.

The Infrastructure dashboard will become a Django Application available
in the tuskar_ui package.

Change-Id: I49c5d46cc16696c4c719ee2c6d65c42b03183ba9
Signed-off-by: Tomas Sedovic <tsedovic@redhat.com>
Add example settings for Horizon

These settings will allow us to configure Horizon with Tuskar UI

Change-Id: I6517d6f9317761cfa119753f7dc015adfe65f3d5
Signed-off-by: Tomas Sedovic <tsedovic@redhat.com>