Added Storage HA support

Closes-Bug: #1366216
Feature: Storage HA support added over existing contrail HA nodes.
Change:
1. cinder backend rbd settngs done for openstack storage nodes.
2. cinder template config set to cinder HA vip.
3. global public_network set to newly added storage node address.
4. new cursh map is loaded using crushtool.
5. cinder rabbit host settings done for openstack storage nodes.
6. skipped compute-restart on openstack storage nodes.
Test: verified storage HA by adding 2 openstack storage nodes on
      storage-master role. HA Cinder volume properly attached to
      VMs.
Change done based on Review comments:
1. removed tabs in storage-ceph-storage.py
2. grep -w added to match exact wip address
3. "storage os" comment changed to "storage openstack"
4. "cfg-hostlist" changed to "config-hosts" as per convention
5. added comments for new parameters
6. setup_storage call done for add_storage_node

Change-Id: I32b2f0e3cccf8c5ea6c05be88ef71199befe6e9d