Closes-Bug: #1398252
Closes-Bug: #1392434
-Issue: 1. contrail-storage-stats not started if the node
           is configured as both master and compute storage
        2. storage-stats getting started on master node
           on node reboots

-Fix: 1. storage compute list is passed to storage setup
      2. contrail-storage-stats daemon configured/started
         based on this storage compute list
      3. Removed contrail storage stats init configs on
         master nodes.

Change-Id: I90e7b2560584a6d3c05d24d50f014530291319a5
-Test: Verified the changes in both HA and non-HA setups