Nova: Look up the host parameter from nova.conf
Nova: Look up the host parameter from nova.conf

... instead of using deprecated hiera CLI.

Depends-on: https://review.opendev.org/854307
Change-Id: Id491fdd8810f65754dc4c9ed9dabd3377bef5c6b

openstack/tripleo-heat-templates,openstack/tripleo-heat-templates