Closes-Bug: #1391346
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
    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: I76ffc0573661b9dc7c5fdc200aa4d447dbdd1f99