container list cannot handle correctly if container secrets have name contain non-ascii characters

[ting.wang]

if name of container secret contains non-ascii characters, like

MariaDB [barbican]> select * from container_secret;
+--------------------------------------+---------------------+---------------------+------------+---------+---------+--------+--------------------------------------+--------------------------------------+
| id | created_at | updated_at | deleted_at | deleted | status | name | container_id | secret_id |
+--------------------------------------+---------------------+---------------------+------------+---------+---------+--------+--------------------------------------+--------------------------------------+
| 846d6079-f191-41cc-a42d-efc2980ec5da | 2016-01-07 03:08:35 | 2016-01-07 03:08:35 | NULL | 0 | PENDING | 你好 | 5e7044e0-8b49-4c0c-b96d-65e0a2c9aded | 95f1c705-d860-4583-801c-94c39e561f82 |

你好 == \u4f60\u597d

then run:
barbican secret container list --debug

'ascii' codec can't encode characters in position 1747-1748: ordinal not in range(128)
Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/cliff/app.py", line 374, in run_subcommand
    result = cmd.run(parsed_args)
  File "/usr/lib/python2.7/site-packages/cliff/display.py", line 93, in run
    self.produce_output(parsed_args, column_names, data)
  File "/usr/lib/python2.7/site-packages/cliff/lister.py", line 56, in produce_output
    parsed_args,
  File "/usr/lib/python2.7/site-packages/cliff/formatters/table.py", line 60, in emit_list
    stdout.write(formatted)
UnicodeEncodeError: 'ascii' codec can't encode characters in position 1747-1748: ordinal not in range(128)
Traceback (most recent call last):
  File "/usr/bin/barbican", line 10, in <module>
    sys.exit(main())
  File "/opt/stack/python-barbicanclient/barbicanclient/barbican.py", line 339, in main
    return barbican_app.run(argv)
  File "/opt/stack/python-barbicanclient/barbicanclient/barbican.py", line 334, in run
    return super(Barbican, self).run(argv)
  File "/usr/lib/python2.7/site-packages/cliff/app.py", line 255, in run
    result = self.run_subcommand(remainder)
  File "/usr/lib/python2.7/site-packages/cliff/app.py", line 374, in run_subcommand
    result = cmd.run(parsed_args)
  File "/usr/lib/python2.7/site-packages/cliff/display.py", line 93, in run
    self.produce_output(parsed_args, column_names, data)
  File "/usr/lib/python2.7/site-packages/cliff/lister.py", line 56, in produce_output
    parsed_args,
  File "/usr/lib/python2.7/site-packages/cliff/formatters/table.py", line 60, in emit_list
    stdout.write(formatted)
UnicodeEncodeError: 'ascii' codec can't encode characters in position 1747-1748: ordinal not in range(128)

but curl -X GET can handle correctly:
curl -X GET http://localhost:9311/v1/containers/5e7044e0-8b49-4c0c-b96d-65e0a2c9aded -H "X-Auth-Token:"

{"status": "ACTIVE", "updated": "2016-01-07T03:08:34", "name": "noname", "consumers": [], "created": "2016-01-07T03:08:34", "container_ref": "http://192.168.0.194:9311/v1/containers/5e7044e0-8b49-4c0c-b96d-65e0a2c9aded", "creator_id": "41770d76c1754a3ca6821dc8763c7ffc", "secret_refs": [{"secret_ref": "http://192.168.0.194:9311/v1/secrets/95f1c705-d860-4583-801c-94c39e561f82", "name": "\u4f60\u597d"}], "type": "generic"}

So, we'd better fix it in barbicanclient