Remove use of legacy keystone client in functional tests
Remove use of legacy keystone client in functional tests

We use it here to verify the new user account information works. We can
do the same thing by just grabbing a catalog.

Change-Id: I55c981a29f4386a53472a88c1618b390f4b64a08

dtroyer/python-openstacksdk,openstack/python-openstacksdk,openstack-infra/shade,stackforge/python-openstacksdk,dtroyer/python-openstacksdk,openstack/python-openstacksdk,openstack-infra/shade,stackforge/python-openstacksdk