Allow cinder-volume to be configured to use nfs on Centos
Allow cinder-volume to be configured to use nfs on Centos

Closes-Bug: 1548508
Partially implements: blueprint  nfs-support-in-cinder

Change-Id: I3b66252290e61f74ea13889fe136ac74863110f4

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