update doc for root is needed when deploying
update doc for root is needed when deploying

Update ansible-deployment to note that root privilege is needed
when deploying.

Change-Id: I80d3792de69c16c05c5285e8113d5924d6192735
Closes-Bug: #1471824

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