Fix tacker dashboard
Fix tacker dashboard

Change tacker_dashboard to tacker_horizon

Change-Id: I6f6f7c53e4ad31f4b6c16c2071a9e1114ef41a57
Closes-Bug: #1662088

GalenMa/kolla,openstack/kolla,openstack/kolla,coolsvap/kolla,GalenMa/kolla,rahulunair/kolla,nihilifer/kolla,coolsvap/kolla,stackforge/kolla,mrangana/kolla,stackforge/kolla,mrangana/kolla,rahulunair/kolla,nihilifer/kolla,coolsvap/kolla,intel-onp/kolla,intel-onp/kolla,stackforge/kolla