Comment 5 for bug 1642326

Actually there is something wrong with output commands:

[root@nailgun ~]# fuel2 config env list
/usr/lib64/python2.7/site-packages/sqlalchemy/ext/declarative/api.py:173: SAWarning: Unmanaged access of declarative attribute __tablename__ from non-mapped class ModelMixin
  (desc.fget.__name__, cls.__name__))
+----+------------+------------------------+
| id | components | hierarchy_levels |
+----+------------+------------------------+
| 1 | [] | [] |
| 2 | [1] | [u'nodes', u'servers'] |
+----+------------+------------------------+

issue:
https://bugs.launchpad.net/fuel/+bug/1644814