output table of datasource-list shouldn't contain unicode prefix

[Rui Chen]

The content of 'config' column is string with unicode prefix, that make users confusion, we should output the string format rather than unicode.

$ openstack congress datasource list
+--------------------------------------+------------+---------+------+--------------------------------------------------------------------------------------------------------------------------------------------------+
| id | name | enabled | type | config |
+--------------------------------------+------------+---------+------+--------------------------------------------------------------------------------------------------------------------------------------------------+
| 06f02db8-6263-4b53-9e78-cba98aa47ab0 | cinder | True | None | {u'username': u'admin', u'tenant_name': u'admin', u'auth_url': u'http://10.229.40.104:5000/v2.0', u'password': u'<hidden>', u'poll_time': u'10'} |
| 210767a3-64f2-4453-a988-ffba96116fc8 | neutronv2 | True | None | {u'username': u'admin', u'tenant_name': u'admin', u'auth_url': u'http://10.229.40.104:5000/v2.0', u'password': u'<hidden>', u'poll_time': u'10'} |
| 477d3034-e676-472f-8849-a87764803ed9 | glancev2 | True | None | {u'username': u'admin', u'tenant_name': u'admin', u'auth_url': u'http://10.229.40.104:5000/v2.0', u'password': u'<hidden>', u'poll_time': u'10'} |
| 7eb92f69-4c00-4132-be26-637948621622 | ceilometer | True | None | {u'username': u'admin', u'tenant_name': u'admin', u'auth_url': u'http://10.229.40.104:5000/v2.0', u'password': u'<hidden>', u'poll_time': u'10'} |
| 8475f79a-305f-4739-8a12-06884494f016 | keystone | True | None | {u'username': u'admin', u'tenant_name': u'admin', u'auth_url': u'http://10.229.40.104:5000/v2.0', u'password': u'<hidden>', u'poll_time': u'10'} |
| cf80bad1-91e0-4cc2-a4d3-53fd3b6333c7 | nova | True | None | {u'username': u'admin', u'tenant_name': u'admin', u'auth_url': u'http://10.229.40.104:5000/v2.0', u'password': u'<hidden>', u'poll_time': u'10'} |
+--------------------------------------+------------+---------+------+--------------------------------------------------------------------------------------------------------------------------------------------------+

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/237917

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/237917
Committed: https://git.openstack.org/cgit/openstack/python-congressclient/commit/?id=3efb993e408e2f65f6d18ed98419cccad87349a3
Submitter: Jenkins
Branch: master

commit 3efb993e408e2f65f6d18ed98419cccad87349a3
Author: Rui Chen <email address hidden>
Date: Wed Oct 21 15:42:02 2015 +0800

    Remove unicode prefix from output of datasource-list

    When we execute command 'congress datasource list', the output content
    of 'config' column is string with unicode prefix, that make users
    confusion, we should output the string format rather than unicode.

    Change-Id: I26f46fb8eef3a89908ec388e2046218480ab560d
    Closes-Bug: #1508320