Ironic: Use generated dnsmasq conf file
Ironic: Use generated dnsmasq conf file

Current puppet-ironic supports generating config file to run dnsmasq
as tftp server.

This change replaces usage of hiera CLI by the generated file to reduce
usage of deprecated hiera CLI.

Change-Id: Id5c6cf3e41e22ee5275d0fd822b313333bfa1b33

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