Improve admin interfaces.

mayan/apps/lock_manager/admin.py

@@ -1,10 +1,11 @@
+from __future__ import unicode_literals
+
 from django.contrib import admin
 
 from .models import Lock
 
 
+@admin.register(Lock)
 class LockAdmin(admin.ModelAdmin):
-    model = Lock
-
-
-admin.site.register(Lock, LockAdmin)
+    date_hierarchy = 'creation_datetime'
+    list_display = ('name', 'creation_datetime', 'timeout')