Added functions to support Rally, Tempest testing in DriveTrain

Added:
- cleanup functions
- running Rally scenarios

The corresponding patch set in mk/mk-pipelines repo:
https://gerrit.mcp.mirantis.net/#/c/9686/

The repo with Docker file that should be cloned:
https://github.com/izadorozhna/rally_tempest_config/

Change-Id: I1bda7b3c11504774580de72a6ed42cc6f25593b8
1 file changed