urlparse imported directly breaking python 3

[Clint Byrum]

urlparse should be imported indirectly using the six library to avoid breaking python3 users of keystoneclient.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/51685

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/51685
Committed: http://github.com/openstack/python-keystoneclient/commit/43e278c8be05a25edd17729ee2ab3de2be8044fe
Submitter: Jenkins
Branch: master

commit 43e278c8be05a25edd17729ee2ab3de2be8044fe
Author: Clint Byrum <email address hidden>
Date: Mon Oct 14 11:16:42 2013 -0700

    Fix python3 incompatible use of urlparse

    Use six to make it work. While we're not yet able to gate
    keystoneclient on py33, we still need keystoneclient to work when
    keystoneclient is included in other libraries' test suites. This was
    discovered while working on python3 for python-tuskarclient.

    Note that together with I65c28896d1551fd537dd7774e87bc479a477a7ab
    keystoneclient can be used safely in python-tuskarclient's py33 tests.

    Closes-bug: #1239802

    Change-Id: Ie6d31dc5fae7e63bb31a5192fa6765fe35dd026a