Fix ocata BVT tests

- Use removing of not used cfg* nodes before generating cluster
  nodes
- Add @pytest.mark.fail_snapshot to mcp11_ocata tests
- Remove outdated salt_cmd definitions from tests

Change-Id: I797efb6bb6a5e451e8fbfe8b38c48a6a761838b6
Reviewed-on: https://review.gerrithub.io/370644
Reviewed-by: Tatyanka Leontovich <tleontovich@mirantis.com>
Tested-by: Tatyanka Leontovich <tleontovich@mirantis.com>
10 files changed