Fix name of the mistral-dashboard horizon plugin
Fix name of the mistral-dashboard horizon plugin

Change-Id: Ia31189b33f1d3c178552da0db1122431e5dd4889

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