Fix playbook_link

tower/migrations/038_change_playbook_repo_to_noc.py

@@ -10,7 +10,7 @@ def migrate(migrator):
             db_table = "environment"
 
         name = CharField(unique=True)
-        config_order = CharField()
+        playbook_link = CharField()
 
     if len(Environment.select()) != 0:
         for env in Environment.select():