tempest_glance_id_setter and tempest_neutron_net_id_setter were
previously using Credentialsv2_0, which do not work in a Keystone v3
environment (and that's what we should be using today).
Closes-Bug: #1633864
Change-Id: I95ea682064ff6365622fc31c562b42014fc52303
Switch tempest_glance_id_setter and tempest_neutron_id_setter to
use openstack client with credentials provided in tempest config.
This will allow to run puppet-tempest on standalone node but adds
dependancy to openstacklib.
Change-Id: I27215a9b0f94db39774e20515eddce4cffd7cadf