[Contrail] Remove a controller-node from environment with Contrail leads to OSTF fail

        Scenario:
            1. Create an environment
            2. Enable and configure Contrail plugin
            3. Add 3 controllers, a compute and a storage nodes
            4. Add 3 nodes with "contrail-db", "contrail-config",
               "contrail-analytics" and "contrail-control" roles on all nodes
            5. Deploy cluster
            6. Run OSTF tests
            7. Delete a Controller node and deploy changes
            8. Run OSTF tests
Actual result: Failed 3 OSTF tests; should fail 1 tests. Names of failed tests:
  - Check that required services are running (failure) Some nova services have not been started.. Please refer to OpenStack logs for more details.
  - Check network connectivity from instance via floating IP (failure) Time limit exceeded while waiting for removing floating IP to finish. Please refer to OpenStack logs for more details.
  - Launch instance with file injection (failure) Time limit exceeded while waiting for removing floating IP to finish. Please refer to OpenStack logs for more details.