added docker repo

roles/horizon/templates/horizon.service

@@ -13,7 +13,7 @@ ExecStart=/usr/bin/docker run --name %n \
   --add-host=nova-controller:{{ hostvars[groups['nova-controller'][0]]['ansible_default_ipv4']['address'] }} \
   --add-host=keystone:{{ hostvars[groups['keystone'][0]]['ansible_default_ipv4']['address'] }} \
   -p 80:80 \
-  hpc/horizon
+  hpc/openstack-horizon
 
 [Install]
 WantedBy=multi-user.target