firewall_gui: display hosts belonging to hostgroup

firewall_gui/static/partials/hostgroup-edit.html

@@ -73,3 +73,11 @@
     </tbody>
   </table>
 </div>
+<div class="span12">
+  <h3>Hosts belonging to this hostgroup</h3>
+  <div class="well well-small">
+    <span class="label label-info" ng-repeat="host in entity.hosts">
+      <a href="#/hosts/{{host.id}}">{{host.name}}</a>
+    </span>
+  </div>
+</div>

firewall_gui/views.py

@@ -365,6 +365,10 @@ def show_hostgroup(request, id):
         },
         'created_at': group.created_at.isoformat(),
         'modified_at': group.modified_at.isoformat(),
+        'hosts': [{
+            'id': host.id,
+            'name': host.hostname
+        } for host in group.host_set.all()],
         'rules': [{
             'id': rule.id,
             'direction': rule.get_direction_display(),