Install heat-dashboard in rpm based distros

The heat-dashboard was recently packaged in RDO [1], let's add it to
the rpm based distros.

 [1] https://github.com/rdo-packages/heat-dashboard-distgit

Change-Id: I0652e172f3651b427805aa3673527677bd3429d8
Related-Bug: #1752132

docker/horizon/Dockerfile.j2

@@ -9,7 +9,6 @@ LABEL maintainer="{{ maintainer }}" name="{{ image_name }}" build-date="{{ build
 
 {% if install_type == 'binary' %}
     {% if base_distro in ['centos', 'oraclelinux', 'rhel'] %}
-        # TODO(jeffrey4l): openstack-heat-dashboard is missing
         {% set horizon_packages = [
                 'gettext',
                 'httpd',
@@ -17,6 +16,7 @@ LABEL maintainer="{{ maintainer }}" name="{{ image_name }}" build-date="{{ build
                 'mod_wsgi',
                 'openstack-cloudkitty-ui',
                 'openstack-dashboard',
+                'openstack-heat-ui',
                 'openstack-ironic-ui',
                 'openstack-magnum-ui',
                 'openstack-manila-ui',