Fix NTP servers hieradata
Fix NTP servers hieradata

This patch enables correctly setting the NTP server passed via
--ntp-server in the overcloud nodes' /etc/ntp.conf.

Change-Id: Iff644b9da51fb8cd1946ad9d297ba0e94d3d782b

trozet/opnfv-tht,trozet/opnfv-tht,openstack/tripleo-heat-templates,dprince/tripleo-heat-templates,openstack/tripleo-heat-templates,trozet/opnfv-tht,dprince/tripleo-heat-templates