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: I0da03f17713dc4753c03b48935a803fd10fa730f
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" into R2.0