dashboard: add edit button for network interfaces

circle/dashboard/templates/dashboard/vm-detail/network.html

@@ -47,7 +47,12 @@
   <h3 class="list-group-item-heading dashboard-vm-details-network-h3">
     <i class="icon-{% if i.host %}globe{% else %}link{% endif %}"></i> {{ i.vlan.name }} 
     {% if not i.host%}({% trans "unmanaged" %}){% endif %}
-    <a href="{% url "dashboard.views.interface-delete" pk=i.pk %}?next={{ request.path }}" class="btn btn-danger btn-xs interface-remove"
+    {% if user.is_superuser %}
+      <a href="{{ i.host.get_absolute_url }}" 
+        class="btn btn-default btn-xs">{% trans "edit" %}</a>
+    {% endif %}
+    <a href="{% url "dashboard.views.interface-delete" pk=i.pk %}?next={{ request.path }}" 
+      class="btn btn-danger btn-xs interface-remove"
       data-interface-pk="{{ i.pk }}">
       {% trans "remove" %}
     </a>
@@ -63,6 +68,8 @@
           <dd>
           {% for g in i.host.groups.all %}
             {{ g }}{% if not forloop.last %},{% endif %}
+            {% empty %}
+            -
           {% endfor %}
           </dd>
         </dl>