Upper bound on keystone-client in requires causes conflict

[John Griffith]

Recent updates of keystone-client introduces a conflict in cinder-requirements resulting in a failure of scheduler libs to load.
Remove the upper-bound pin on keystone-client in cinder requires.

Output from trace/error is below:

2013-07-03 17:08:41.707 ERROR stevedore.extension [-] Could not load 'CapacityWeigher': (python-keystoneclient 0.3.0.12.g9ee038f (/opt/stack/python-keystoneclient), Requirement.parse('python-keystoneclient>=0.2,<0.3'))
2013-07-03 17:08:41.707 ERROR stevedore.extension [-] (python-keystoneclient 0.3.0.12.g9ee038f (/opt/stack/python-keystoneclient), Requirement.parse('python-keystoneclient>=0.2,<0.3'))
2013-07-03 17:08:41.707 TRACE stevedore.extension Traceback (most recent call last):
2013-07-03 17:08:41.707 TRACE stevedore.extension File "/usr/local/lib/python2.7/dist-packages/stevedore/extension.py", line 83, in _load_plugins
2013-07-03 17:08:41.707 TRACE stevedore.extension invoke_kwds,
2013-07-03 17:08:41.707 TRACE stevedore.extension File "/usr/local/lib/python2.7/dist-packages/stevedore/extension.py", line 95, in _load_one_plugin
2013-07-03 17:08:41.707 TRACE stevedore.extension plugin = ep.load()
2013-07-03 17:08:41.707 TRACE stevedore.extension File "/usr/lib/python2.7/dist-packages/pkg_resources.py", line 1988, in load
2013-07-03 17:08:41.707 TRACE stevedore.extension if require: self.require(env, installer)
2013-07-03 17:08:41.707 TRACE stevedore.extension File "/usr/lib/python2.7/dist-packages/pkg_resources.py", line 2001, in require
2013-07-03 17:08:41.707 TRACE stevedore.extension working_set.resolve(self.dist.requires(self.extras),env,installer))
2013-07-03 17:08:41.707 TRACE stevedore.extension File "/usr/lib/python2.7/dist-packages/pkg_resources.py", line 588, in resolve
2013-07-03 17:08:41.707 TRACE stevedore.extension raise VersionConflict(dist,req) # XXX put more info here
2013-07-03 17:08:41.707 TRACE stevedore.extension VersionConflict: (python-keystoneclient 0.3.0.12.g9ee038f (/opt/stack/python-keystoneclient), Requirement.parse('python-keystoneclient>=0.2,<0.3'))
2013-07-03 17:08:41.707 TRACE stevedore.extension

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/35571