Updated openstack/openstack
Project: openstack-dev/devstack  8928ce12b6c6ddf74b6942463fcaf16b9fd74844
null
Set default_network in tempest.conf

This is to support testing of change
Ia78582cac3790653c2281a5b63d953cd46d5c290 in Tempest.

Change-Id: Ibb812e2598fb11b7eef21a0868ee9baeea73186c