New required-projects for Iotronic-ui.
New required-projects for Iotronic-ui.

Iotronic-ui needs openstack/horizon as required-projects.

Change-Id: Ib7df7f72d7cbebc3af99ae2e5553dc2d98b458e8

openstack-infra/project-config,openstack-infra/project-config