Enable trove dashboard when enable_trove is yes

Depends-On: I1e9295da273055bfb870c7a87a32b989f3f61e8b

Change-Id: I18733775627d7f81cca0b7aa91f006ac48f1a755
Closes-Bug: #1646337

ansible/roles/horizon/tasks/start.yml

@@ -10,6 +10,7 @@
       ENABLE_MANILA: "{{ 'yes' if  enable_manila | bool else 'no' }}"
       ENABLE_NEUTRON_LBAAS: "{{ 'yes' if  enable_neutron_lbaas | bool else 'no' }}"
       ENABLE_SAHARA: "{{ 'yes' if enable_sahara | bool else 'no' }}"
+      ENABLE_TROVE: "{{ 'yes' if enable_trove | bool else 'no' }}"
     volumes:
       - "{{ node_config_directory }}/horizon/:{{ container_config_directory }}/:ro"
       - "/etc/localtime:/etc/localtime:ro"