fix(controller): fix container admin view

A container does not have a cluster attribute, but an app does!

fixes #743

Author: Matthew Fisher

controller/api/admin.py

@@ -63,7 +63,7 @@ class ContainerAdmin(admin.ModelAdmin):
     in the Django admin.
     """
     date_hierarchy = 'created'
-    list_display = ('short_name', 'owner', 'cluster', 'app', 'state')
+    list_display = ('short_name', 'owner', 'app', 'state')
     list_filter = ('owner', 'cluster', 'app', 'state')
 admin.site.register(Container, ContainerAdmin)