Fix an issue where no test coverage report is created
Running `tox -ecover` does not generate the coverage report.
Instead the following is displayed to the user:
No coverage report, but warnings instead:
Coverage.py warning: Module nova-dpm was never imported.
This patch set fixes the problem.
* It's the initial commit based on coockiecutter template
* Upstream nova is installed using tox_install.sh as install_command
* zhmcclient is installed via tox dependencies as zhmcclient is not
listed in global openstack requirements and therefore cannot be
listed in requirements.txt