Can not use pipe when unicode exist in stdout

[Jeffrey Zhang]

When there is unicode exist in the keystone client's output, error raise when using linux pipe to do more thing.

How to reproduce
1. Create user using unicode

$ keystone --os-endpoint=http://localhost:35357/v2.0/ --os-token=ADMIN --debug user-create --name "张雷" --pass '123' --enabled true

2. get all the user with grep command, error raise

keystone --os-endpoint=http://localhost:35357/v2.0/ --os-token=ADMIN user-list | grep True
'ascii' codec can't encode characters in position 223-224: ordinal not in range(128)

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/56033

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/56033
Committed: http://github.com/openstack/python-keystoneclient/commit/98231f6ccdbbf248d479efef09b88f7abee49383
Submitter: Jenkins
Branch: master

commit 98231f6ccdbbf248d479efef09b88f7abee49383
Author: Lei Zhang <email address hidden>
Date: Tue Nov 12 22:23:49 2013 +0800

    Encode the text before print it to console

    Closes-Bug: #1250490
    Change-Id: I516806a0f8a136bb66c64dcdcd07cee6d297e619