Updated openstack/openstack
Project: openstack/horizon  551e784437af4177103e092952e34d5e39869f9f

Improve sub-navigation styling

Change-Id: Iae11b46f2e5b340e2c69f812d4f09f390d018749
Closes-bug: #1378568
Co-Authored by: Jiri Tomasek <jtomasek@redhat.com>