Add additional ntp information around ceph
Add additional ntp information around ceph

Mention `chrony` since thats what docs.openstack.org recommends for
WAN connections. It does do better than ntpd
Change-Id: I28caade26492294bf12b092ff949003c7bf0bb8e

openstack/kolla,coolsvap/kolla,toby82/kolla,toby82/kolla,negronjl/kolla,dardelean/kolla-ansible,negronjl/kolla,GalenMa/kolla,stackforge/kolla,toby82/kolla,nihilifer/kolla,coolsvap/kolla,negronjl/kolla,mrangana/kolla,intel-onp/kolla,openstack/kolla,limamauricio/mykolla,stackforge/kolla,limamauricio/mykolla,stackforge/kolla,rahulunair/kolla,GalenMa/kolla,tonyli71/kolla,coolsvap/kolla,mrangana/kolla,mandre/kolla,dardelean/kolla-ansible,mandre/kolla,limamauricio/mykolla,intel-onp/kolla,rahulunair/kolla,mandre/kolla,nihilifer/kolla,dardelean/kolla-ansible,tonyli71/kolla