Rebalance failed after adding back the auto-failover CC node in the cluster.

1. Initialize the cluster with 1 KV and 3 cbas nodes.
2. Add default bucket and ingest some data in CBAS.
3. Now block tcp ports on CC node:

/sbin/iptables -A INPUT -p tcp -i eth0 --dport 1000:65535 -j REJECT

4. Observe that after 120s the cc node is auto-failed.
5. Flush the IPtables on CC using iptables -F
6. Now the node becomes available to add back to the cluster. Add back and rebalance.
Rebalance failed: Rebalance exited with reason {service_rebalance_failed,cbas,
{lost_connection,shutdown}}
But analytics is working fine after rebalance failure so this must be somewhere in the cleanup.