Import build-openstack-api-ref
Import build-openstack-api-ref

We can add this in-repo, move it over from project-config.

Change-Id: Ib8b535728461516f415af07d4f177ac1662f8b24

openstack/openstackdocstheme,openstack/openstackdocstheme,openstack/openstackdocstheme,openstack/openstackdocstheme