Set openstack-tox-cover as voting for monasca-ui
Set openstack-tox-cover as voting for monasca-ui

Depends-On: https://review.openstack.org/553800
Change-Id: I59bc94b0b1bd76dfe612faf5a93e80ac37ca161e

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