Also install python3-tempest-horizon
Also install python3-tempest-horizon

Also install python3-tempest-horizon, which I forgot when switching to
packages instead of python setup.py install.

Change-Id: Ice662ce86efd9b93d962b1c0b2e43c748f44c35f

openstack/puppet-openstack-integration,openstack/puppet-openstack-integration,openstack/puppet-openstack-integration