Updated client to work with newer keystone version.
Updated client to work with newer keystone version.

citrix-openstack/build-python-troveclient,metacloud/python-troveclient,cp16net/python-troveclient,Tesora/tesora-python-troveclient,citrix-openstack/build-python-troveclient,metacloud/python-troveclient,openstack/python-troveclient,Tesora/tesora-python-troveclient,citrix-openstack-build/python-troveclient,citrix-openstack-build/python-troveclient,openstack/python-troveclient,cp16net/python-troveclient