Comment 0 for bug 1467655

Description:
/etc/hosts contains entries for nodes that were removed from cluster (or redeployed)

Environment:
- MOS 6.0
- any deployment mode
- any OS

How to reproduce:
1) Deploy cluster with 2 nodes (controller, compute).
2) Remove compute node from cluster (and push "Deploy changes")
3) Add same node to cluster (and push "Deploy changes")
4) Login to controller and check /etc/hosts
Expected result:
it will contain TWO entities (i.e. node-1, node-3)

Actual result:
it contains THREE entities (node-[1,2,3])