Load manila-ui in horizon

Change-Id: I082c0a694eb138938abec2f4bc09002fd1d0ef9d

ansible/roles/horizon/tasks/start.yml

@@ -6,6 +6,7 @@
     image: "{{ horizon_image_full }}"
     name: "horizon"
     environment:
+      ENABLE_MANILA: "{{ 'yes' if  enable_manila | bool else 'no' }}"
       ENABLE_NEUTRON_LBAAS: "{{ 'yes' if  enable_neutron_lbaas | bool else 'no' }}"
     volumes:
       - "{{ node_config_directory }}/horizon/:{{ container_config_directory }}/:ro"