Closes-Bug: #1392434
  -Issue: 1. contrail-storage-stats is getting started on
              non storage-compute nodes
           2. cleanup of contrail-storage-stats not done
              during storage unconfigure
  -Fix: 1. contrail-storage-stats started only on storage-compute
            nodes.
         2. During uncongiure, if the storage-stats daemon running
            then it is terminated and reset config to defaults
  -Test: Verified the changes in both HA and non-HA setups

   Modified according to review-1
   Modified according to review-2
   1. If Contrail vip (openstack and contrail on separate nodes)
       configured use that for contrail stats else openstack vip
       (openstack and contrail together case)configured use that
       else config host discovery address
   2. Contrail vip value passed from fab utils to provision
       setup (Saravanan change)

Change-Id: Iec9aa6981ceec76bcde74d147cf235147dcf96f9
Merge "Closes-Bug: #1392434   -Issue: 1. contrail-storage-stats is getting started on               non storage-compute nodes            2. cleanup of contrail-storage-stats not done               during storage unconfigure   -Fix: 1. contrail-storage-stats started only on storage-compute             nodes.          2. During uncongiure, if the storage-stats daemon running             then it is terminated and reset config to defaults   -Test: Verified the changes in both HA and non-HA setups"