add an initial version to teuthology

Signed-off-by: Alfredo Deza <alfredo.deza@inktank.com>
pull the version and description in setup.py

Signed-off-by: Alfredo Deza <alfredo.deza@inktank.com>
create a --version flag for teuthology

Signed-off-by: Alfredo Deza <alfredo.deza@inktank.com>
Merge pull request #305 from ceph/wip-8640

implement `--version` and improve `setup.py`