Implements DNS enpoint tests when nodes are being replaced one by one in the cluster

[dkropachev]

We need to have a test that does what we do on the cloud:

1. Driver should be configured to re-resolve DNS endpoints.
2. Deploy cluster of 3 nodes
3. Replace all nodes one by one (changing IP address on both node and dns)
4. Make sure that session that is created at the begging is still operational at the end of the test, and all nodes are reachable