Updated openstack/openstack
Project: openstack-infra/devstack-gate  7968a7a3caa355aa4d067b93b0e87037f4d26956

multi-node dg setup

Adding intial support for multi-node devstack jobs,
by using the nodepool's subnode feature.

TODO: remove extra set -x
TODO: Use the feature grid
TODO: improve logging

Change-Id: I37fb0924be1676be1a1e301094b6e5a4cd348969